Helpppppp

I have a crush on a guy that I fine my self thinking about all the time I also have a boyfriend that is never on my mind as much as my crush I feel like such a bad person and I don’t no what to do should i stay with my boyfriend who I think I love and know I care for or try something new with my crush with the chance of loosing my boyfriend and having the risk of my crush not liking me back I’m 16 and am too old too be mucking around with peoples feelings I don’t want to be that girl! Someone please give me advice I desperately need it