What are some good songs about being in love with the person you are cheating with?

I was with this guy for almost nine months and we had a falling out and i began a relationship with the other guy. Its been 6 months since and I never thought the first guy and I would ever talk again but we are now.. He is back with his ex from before me and i am with this other guy. I feel like he is my soul-mate but we are both scared to hurt everyone in the situation. Songs about this? We talk A lot in song and some of them have been Kesha's your love is my drug. Katy Perry's thinking of you. Mae's Sun Chris Young's tomorrow etc..