In love with boyfriends friend?

I know whoever reads this will think I’m a horrible person right off the bat…but please keep in mind I can’t control how I naturally feel. I know it’s a bad situation, and I don’t want anyone getting hurt including myself, but it’s a lose lose.
I met his friend a few months into our relationship, and it was like something clicked between us instantly. Nothing intimate happened, I haven’t cheated…but we’ve been talking a lot and I’m really interested in him, and the feeling is mutual.

Part of me things I should leave my boyfriend, part thinks I should stay and see if the feelings fade out for the friend… Any advice would be amazing
In love with boyfriends friend?
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