I’m heterosexual but I kinda like females aswell

16 and sexually active with my boyfriend.I’ve been kind off liking girls aswell and interested in having a sexual relationship with an female.I don’t know how to tell my man I want him and only him I wanna be with him.I’m definitely heterosexual but can’t control my feelings for females.So this girl likes me.She said that she’s attracted to me and that every time she looks at me she sees a connection.I do too but I’m with my boyfriend and want to continue being sexually active with him only.Should I tell her I’ll see if next time if there’s a chance of us being together?