Long Distance Relationship With Crush On Another Guy?

I’m 21 and i’ve been in a relationship with my boyfriends for almost 4 years. I am away at college and the whole “long distance thing is really starting to wear me thin. I think we have good relationship, we’ve been through many tough times including helping me through a tough illness. We are very close and we talk almost every day, but I can’t help thinking about other guys sometimes. Our relationship is very serious and we have both talked about moving in together and marraige and children etc. We have a very healthy relation, but I have just been noticing this guy around my school that I am very attracted to, and having more self confidence, am dying to flirt with. I love my boyfriend but I can’t help thinking that I should date other ppl. I really don’t want to break up with him because I love him dearly, but I just don’t want to regret not dating other ppl, but I know to suggest this would crush him Any thoughts?