help??

I can't help but wonder if I'm making a mistake dating my bf. I love and care about him but I can't help but wonder if there's something else out there for me. Something that I'm missing out on. There's this other guy that came back into my life saying he's ready to get serious. (We had hooked up a couple times before I was in a relationship). But as you know I have a bf and I told him that and he respects that. But now he wants to stay in my life as a friend and it's making me question my relationship