Boyfriends bestfriend.......

I've been with my boyfriend now for over 3 years. We are so much alike and he is the peaches to my creame, but lately he has been kind of off like something is wrong with him and hasn't been showing me as much attention as usual, but since he has stopped, his best friend (and roommate ) has started talking to me when he doesn't, asking me about my day (like he genuinely cares) and we make wicked eye contact that makes my stomach drop. I know it's wrong, mainly bc I am in love with my boyfriend and he makes me happy, but is it wrong to enjoy the attention and those eyes on me when my boyfriend isn't doing that? .. Like I've actually had dreams about that and not the kind of dream you wanna wake up and talk about ... The kind you want to lowkey think about all day and get arroused just replaying it over and over in your head.... Please tell me what you think   😬😩