Boyfriends wife

My current boyfriend and I have been together 3 months I,care a lot about him. We live together. When we got together he had been seperstef from his wife for about 7 months now it's almost been 10 he promised me he was going to divorce her that I was his future. They have been together 15 years and have 3 kids. Divorcing for certain reasons. Well shes been in jail and just got out. He's been talking to her and they talked about getting back together my biggest fear. I confronted him. He said he doesn't know what he's going to do that he cares about me a lot but he still loves her and he's got a big decision to make. He knows he's hurting me. He said he hates seeing me like this. I love him so much and I don't wanna lose him. He's still with me for now and acting like everything is normal. I'm scared of losing him. Help advice please. My biggest fear is coming true.