Tell me if it is weird if?a?

if I get upset, protective, jealous when my bestfriend who is a girl (and I'm a guy) goes out hooking up with guys and have with them? She's a really good friend where both of us always tell each other secrets and stuff, some about what we did and when she tells me the things she does with guys it just pisses me off and gets me upset when a good girl like her go out and do something carelessly like that. I kinda like her and my feelings for her has been on and off. I try to stop it because ik it'll ruin our friendship