confused 🤷‍♀️

Abbi
So I've been with my boyfriend nearly four months, and I love him a lot. But lately I've been developing feelings for another guy, and to make it worse, that guy is my bfs best friend. My bf is extremely jealous and hates to see other guys around me, and I know it would break his heart if he knew. But I'm having trouble staying away from my crush... Advice?😔