Like how your friend gave you the idea of how he didn't like you, regardless of his relationship with you at the time before you two broke up.
You probably have a better idea on what to do in your next relationship, but let's recap:
If ANY relationship means anything to you (boyfriend, girlfriend, family, friend), what you would have done instead of breaking up with them, is to TALK it out with them, and ask about their feelings before anything else.
It's quite childish and unreasonable to suddenly break it off with someone when they don't even know what they did wrong, or why, and it could be very damaging.
When you're in a relationship with someone, you must communicate thoroughly and clearly about your feelings as with theirs, and work out a solution where the both of you win.
What you could do now, is exactly what I stated above, you need to have a talk with him FACE TO FACE about this whole ordeal, because it seems to me that people outside of your relationship with him are tampering with it.
If he refuses to talk to you, then he's being immature as well. You must both be adults and stop using your friends as the middle man of handling the relationship -- it could only end disastrous this way.
Think of it this way:
If you one day get married, and you live with your husband, are you going to have your friends tell you what he's thinking about? Are they going to tell you what he's feeling when you're gone? -- Or how about his friends asking how you feel, and then giving a feedback to your husband about it? No, HECK no, and I'm sure you and your husband don't want that as well.
So, go on. Talk to him!
Tell him it's an honest mistake and that you should have known better to speak to him about it.
I would like to mention also, that your ex is pulling the same immaturity, probably in resentment of you for doing it in the first place.
You both must speak in honesty about everything -- what you think and feel -- and see where you both want to take the relationship if it could ever be fixed.
I personally think it could work out again, as long as he's willing, but at the same time, he jumped into two relationships after you (I'm thinking, to make you jealous, or because he was so hurt that he's rebounding, or he's just plain mad at you and wants to hurt you back, or perhaps he just likes to jump into many relationships).
Whatever it is, TALK to him so you both have a clear understanding of the whole situation, and how you both feel about each other.
Good luck, take care!
Discussion closed - why not create your own thread?