Me and my female friend, both have feelings for each other, but we both have boyfriends

Guys, I really don’t know what to do me and my best friend(we’re both girls) just decide to call in the middle of the night because we were bored and haven’t talked for a long time so whatever we just were talking like normal gossiping joking around and then out of nowhere we start talking about more sexual things idk How we got into that direction and next thing we know we’re both admitting that we had sexual dreams and fantasies about each other and the next thing I know we’re both admitting our feelings for each other and I’m really ashamed to admit this, but we were very close to cheating on call luckily, we both ended the call before things got out of hand, but I don’t know what to do. Her boyfriend used to be my best friend when we were younger, and my boyfriend is literally the best boyfriend in the whole world, I don’t wanna hurt either of them like this, and I don’t wanna be a cheater but fuck idk what to do