Don't know what else to do

So my ex girlfriend/the mother of my child of 5years broke up with me and is involved in a rebound relationship I really want her back but don't know what to do I've tried expressing my feelings but that seems to push your further away and ,loser to her new boyfriend I know she still loves me and care for me I can see it in her eyes but yet she act like she doesnt her new relationship happened so fast and it seems to be getting strong very fast could someone please tell me what to do I can't do the no contact me because we have a daughter together any advice is good thank you

Fake it till you make it. Act like her being in a relationship doesn't bother you. Start dating other people. You'll miss you or....she actually won't care. Which sucks, I know. but if talking to her is pushing her away...then stop. Be civil, since you have a daughter together, but stop putting your feelings on the line. It's hard I know. I struggle everyday, but you have to if she's to ever come around or if you're ever going to get closure. I don't believe you should fight that hard for someone to love you. You really shouldn't. If she wants you she would be putting in some effort. and that's hard to hear I know, but you have to let it happen.