Crushing but in a relationship

I love my boyfriend and I see a future . But I'm away in college and he lives in our hometown. There are so many interesting sweet and attractive guys in college that try and talk to me . I make friends with them and exchange snaps and my boyfriend really hates it and I feel guilty when I do but im a flirty person when I'm not able to be silly and flirty it honestly feels like I'm having to suppress who I am ? Like I end up just being shy, quiet and lonely. So I don't know what to do.