I've been in a relationship for 3 1/2 years but theres this guy...?

I've been w/ my bf for 3 1/2 years our relationship is alright. I'm 19 he's 21 and he lives kind of far so we only see eachother on the weekends. Because of our long distance i often feel lonely, and he doesn't really like talking to me he tells me my days arent interesting enough to listen. I really love my bf even though i know things aren't healthy. There is this guy that i've been friends w/ for a few years and we like eachother. He's older than i am 23 and he's everything that i want. It makes things very tempting. He's always around and it gives me someone to talk to because my bf doesn't find me interesting enough. I'm really attracted to this guy, and i think about him a lot even though i'll neva admit it to him and i'm unsure on what to do.. Please Please Please Help!!