Girls, you ever dated a guy but also had a friend that you just couldn’t help but be sexually attracted too?

I feel horrible cuz I absolutely love my boyfriend. Been dating for 2 years, but this guy who is my best friend’s-best guy friend comes over with her frequently, lately.

She and Him are both very attractive but are like brother and sister so it’s like he’s free to flirt with but I feel bad cuz I’m in a relationship...

I never post on here cuz I never really need to but i don’t wanna tell anyone bout this. But should I feel slutty that I can’t help but check him out but he does have a very noticeable bulge that I literally can NOT-NOT stare at secretly😂😂😂. I don't know I feel horrible cuz I find myself secretly excited when my girl tells me she’s coming over with him. My boyfriend hates how we always hit it off. And you can tell he sees something that is cause for jealousy to an extent that makes me hate him for it. But it’s my fault at the same time cuz what he senses is not just paranoia. He’s never even hinted at anything like hooking up but he told my girl he thinks I’m adorable and would totally date me but he doesn’t even try cuz he’s actually a gentleman. I don't know but I’m losing my mind and I really just wanted to vent so if this ever is found then ohhhhh well I can’t tell anyone and this fucker has me feeling some kinda way.
Girls, you ever dated a guy but also had a friend that you just couldn’t help but be sexually attracted too?
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