CONFUSED :(

So Ive been with my boyfriend for about 8 months. We haven't seen eye to eye in a while and we argue alot and I feel like our relationship is becoming a burden for the both of us.
2 weeks ago I took a trip with my parents to Georgia to visit my Aunt and cousins. While I was there I met my cousins best friend who I started to like. Him and I have a lot in common and we get along very well. The problem is: I technically still have a boyfriend and my cousins friend is alot older(he's 26 and I'm 19). Another problem is he's in love with a girl that's his best friend/coworker.
His feelings for her stops him from liking me more. It's like he backs away from me sometimes because he likes her so much :( I know that I really like him a lot and he likes me too.
I have no idea what to do about this situation. I'm soo confused. Idk if I should leave him alone or keep pursuing him. I am currently not talking to him now because it's really hard to like someone so much that loves someone else. It hurts my feelings when he talks about her (he doesn't know that). I think he's chasing after something that is hopeless because she told him she didn't want a relationship but I guess he's taking the risk anways .... I think about him all the time and I want to call him but my pride is getting in the way .... Like why I should I make a effort to talk someone that doesn't even like me as much as I like them.
#Advice Needed <3