Yes, good reply. There is a book that has been mentioned here several times: No more Mr. Nice Guy. Good read. There is also already lots of material here on GC referring to Nice Guys, so everything is more or less just repeating.
Nice Guy is a weak person, too compliant with girls, not enough spine. She tells him to bring her stuff, so he brings her stuff. She tells him to wait for him, so he waits for her. She tells him to jump, so he jumps. He waits by the phone for her replies, he texts her back immediately. He waits for her when she is late for a date, and when she finally shows up one hour later he says no problem.
He is always waiting for her decisions, for her approval. He worries too much about what she thinks and says about him. He always tries to prove himself to her. He never decides where to go, what to do, he never leads.
He always smiles, he is apologetic, he never fights. He doesn't take any personal space, he always backs away. He is no treat to anyone.
He is always there for her (and she is never there for her), he has very low value. He puts girls on pedestal. In relationship, she is the boss, she is the one who is making decisions, she is the one in charge of the relationship - he is only doing things that she wants.
He is investing too much into the relationship, while she usually does nothing. He is buying her meals, coffee, tickets - yet she never buys anything for him. He is always doing stuff for her, but she rarely do anything for him.
He is begging her not to leave him, he is supplicating, he feels sorry for himself. He is manipulative, he is dramatic, he is emotionally unstable, he is co-dependent. He is needy and clingy, he just can't be happy without a girl, he always needs someone to attach himself to.
He is always the one who is dumped, he never has the heart to dump the girl. He always feels sorry for the girls, he tries to save them, provide for them, protect them (especially from all the bad guys that fuck her).
This guy never gets laid, he always gets dumped, and he never understands why. It is because of all of the above, duh.
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Nice Guy is like a plague of this society, it is a disaster. The whole society is saturated with Nice Guys. Because of Nice Guys we have huge problems in society, men in general are being disrespected, there is lots of entitlement (people think they deserve stuff for nothing) and so forth.
So when a guy realizes that his behavior is incorrect, what he usually does is that he tries to turn it 180 degree around, he starts doing the exact opposite. Which is logical but it is not optimal approach. You don't need to turn 180 degree around - you just need 90, if that makes sense. There is lots of behavior of Nice Guys that can be utilized in seduction. So some general guidance for correcting this behavior:
* You want to be more leading, more dominating. You want to have more assertiveness. You want to be making more decisions, especially the major ones. So that basically means that you should be in charge of that relationship from day 1. You don't have to be in charge 100% of the time, that is an incorrect misinterpretation. Just keep it around 55-65%, that is good enough. Ideally, once you show that you are a dominant guy who knows what he wants she will by default fall into more submissive position.
* Similarly, don't leave the decision on having sex on her. It rarely happens. Simply see it as your responsibility, you chose where and when, and you are the one who has to push for it. If she wants to contribute, great, but again it doesn't happen often.
* Watch your investing into her, financial, emotional, behavioral,... What do you do to keep her around vs what does she do to keep you? Many guys do 80% and she does 20%, or nothing. That needs to change. She needs to be doing at least 55%, she needs to be investing more than you. REWARD her for doing good things for you, don't ignore it, show appreciation. Ideally you will reward her with good sex for whatever she'll do for you...
* You want to say NO once in a while. You don't have to be an asshole about it but no is no
You: Hey, I got to go to see my friends next Wednesday
She: But I was thinking we can go do XYZ, I really want to do XYZ, please please
You: Yea, but I'm going to see to see my friends
She: Let's go do XYZ, puppy eyes
You: No, we'll do XYZ week later, I'm going to see my friends
.... Once you decide on something you cannot back down. This is important, this is your decision, your leading, this is your spine. She WILL test you on this, so make sure you don't fail. You will do this and there is no other way, there is no compromise, there is no negotiation about it. She might get mad, upset, pissed at you (and she WILL), but it doesn't matter. At the same time, you don't have to do this every day, nor every week, simply once in a while is good enough...
* Don't be needy and clingy. Sure you want that pussy, there is nothing wrong with it. But you don't need her, you can be happy without her. Show her that you can walk away from her and be happy on your own, at least at the beginning. Show her that you will not chase her, but you will reward her for good behavior
* Don't show any fucking drama. I mean, it is just disgusting when a guy shows drama. Avoid all passive-aggressive behavior. Avoid being overly emotional
* Know what you want. Find some purpose in your life for God's sake. Have some goals, things to achieve, hobbies to live for, find some passion, something to be excited about... I know you don't give a damn, but learn to give a damn. Show that you really want something in your life, show that something really matters to you, and go for it. That's a winner attitude, struggle and achievement, desire to conquer, overcome obstacles no matter how long it takes... It doesn't last just one day or one week, this is for years. Don't just sit home, watch tv or play games... If you don't know what, well, stick with the basic stuff, do some sport, get some college degree or advanced degree... I know it is difficult - and that's exactly why you should be doing it...