Crushing on my Boyfriend's Cousin. Is it a Phase?

I got a sorta big crush on my boyfriends cousin. I try my hardest to snap myself out of it because I know its wrong but I cant, I even definitely no I like him because I always get jealous when girls try to talk to him but off course I don't show it he doesn't know I like him back. Its even crazier because he has told me plenty of times how much he likes me and always gets mad at my boyfriend(his cousin) when he hurts me or gets me mad. But he knows how much my boyfriend loves me and would never try anything with me because he loves my boyfriend to death as a brother. The other day he I.M'd me after me and my boyfriend got in a argument (witch is a totally different story) he told me he loved me and would treat me way better then him and sense I'm taken by his cousin I'm his best friend. He gives me advise on my relationship and everything he tells me what makes my boyfriend mad and happy and comforts me when I'm sad not touchy feely only with words we never touch not even hug I wouldn't ever feel right anyway I already feel guilty liking him but the weird part is not guilty enough. I love my boyfriend to death for three years we been through it all together but the thing is everything we been through was caused by my bf(another long story) their are so many things he doesn't do for me that his cousin does I hide it really good its never obvious. I'd never leave my boyfriend for his cousin it seems so Jerry springer lol I don't know what I'm asking I guess opinions will help I now understand the saying: you can't help who you like
Crushing on my Boyfriend's Cousin. Is it a Phase?
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