how to rebuild your sex life?

Allie • Mom of 2
So my boyfriend and I have been together 5 yrs (I don't believe in marriage) we have two daughters together. But we have had a lot of trust issues over the years. I have always been open and faithful but I have caught him talking to other girls etc. I gave him a second chance he betrayed me again so I pack my bags and my kids bags and was going to leave but he asked me for on last chance and he signed up for counceling. But I don't trust him and we haven't had sex in months and idk if I want to. I made a commitment to him and our family and I want to give him one LAST chance because he really had been trying this time. But idk how to have sex with him when I know he wanted other women besides me and he not only betrayed me and our relationship but our family. And I asked him what would you do if one of our daughters was in the situation and of course he said well I would want to kick that kids ass and tell my daughter to leave him. So he wouldn't want his daughter in this situation but he would put me through it? Idk how to go back to the relationship we had before I found out what he was doing. Any advise???? Really lost here. I don't want to tear apart my family and I want to believe counseling will help but I'm not sure at the same time... I