He left me....

So my first love broke up with me years ago no warning for his current bm.. we finally reconnected about 3 years later and they have a daughter together she has his moms heart and the rest leg the family they have each other’s names tattooed and I recently got his. His only tat is her name he picks me up in her car we mess around somewhere and he explained to me he is only with her so she won’t take his child but he goes crazy when other guys talk to her I have his heart i know he loves me he just post her and stay with her for the baby but how much longer do I wait it’s been a year since we started back messing around. I think I’m gonna tell her. She has his whole family brainwashed it’s like they’ll turn on him for her