Ladies?

So last night, My ex boyfriend .. Whom I have had a baby with contacted me. Mind you we lost our baby, and we haven't been together in a year and a half. It was honestly the most difficult breakup of my life. Anyway, I have a new boyfriend now and am happy. It took me a long while to open up and let someone in again.. But it happened because I decided to let go of all that was keeping me from being happy. Long story short, I might need a few opinions about this. I have no more feelings for my ex (baby daddy). The most I have for him is a love that will always be put away in my heart for him because of our past situation. He asked me if I wanted to grab a bite to eat this weekend.. I said sure. Should I tell my bf about this?? Or just keep it to myself? Like what would you do? I feel like if I tell my bf, he'd be like " oh why are you telling me this" and then I'd feel like he'd just say, " do your thing." But I know he trusts me.. It's just the fact our relationship is fairly newer.. But he knows I'm loyal to him. I just don't know what to do. Like would it be necessary to tell him? Hmm 🤔 any thoughts or opinions.. Anything would be cool. Thank you girls! Xo