Caught feelings?

Help, I think i caught feelings for this guy I've been having sex with. He's my friend and all, don't get me wrong (we're friends with benefits), but i just am scared that I've caught feelings. Honestly, I don't know but i constantly think about the events that led us to having sex & actually having sex all day long--any chance i get, really. I hope I don't catch feelings because everyone leaves, and I end up getting hurt. He's friends with this girl Elly* (named changed for privacy) and she previously threatened to take my life, and they drove around for a bit and smoked weed together with Jane* (name changed). People kept sending me pictures of them, because they thought him and I were a thing. I got a little jealous, and a little hurt, but nothing too major. Does it sound like i've caught feelings?