I don't know what to do

So I think I may be in an affair. It started with us just being friends then it turned into flirting now it's gotten a bit out of control. I don't know why but I feel trapped in my marriage I have no way to leave even if I wanted to. But this "friend" gives me butterflies and makes me smile. Like I feel so happy when he is around. Maybe it's because my husband got lazy in our relationship or maybe it was the lack of intimacy or pleasure on my end. (It was constantly about him he would get off and I would just be left like that.) But the "friend" listens and he is easy to talk to I think I have feelings for him I don't know we haven't done anything (yet) I just dont know what to do I really like my "friend". I don't know if I even want to stop the affair. I don't know