I've been with my ex for 3 1/2 years till last Saturday when she left me for another man. We have a daughter together. I'm 21, she's 20. She said she doesn't love me anymore but wants me in our daughters life, and to keep me in hers. Now I love her with all my heart and this whole things hurts like crazy. I made some mistakes in the relationship, and she couldn't get over them, I wish there was something I could do. Her new guy doesn't like her talking to me, but we need to for our daughter.

Anything I could do to show her I still love her and get her to love me again, I'm trying to give her space for now, hopefully her space makes her realize she still loves me.

You are contradicting yourself. The need to talk to her because you want to make her love you again is not talking to her because you "need to for your daughter". You are going to have to learn to be a good father without always wanting to get back with the mother. She has a relationship, be respectful of it. Give her space so that she can live her live, and dedicate yourself to the daughter, NOT the mother. If she has left you for another man, it probably isn't an overnight thing, women usually think about doing something like that before jumping around commitments. However, do you really want someone who has done that to you in your life? Be a father, don't return to someone who has no value for you.

She has been cheating on you guy, and that's not a thing to ignore or forget. Just be a good dad, the best you can be, and tolerate the mother, but don't try and convince her to take you back.