I found out my boyfriend has a side piece, cheated on his ex with her and cheated on me for 3 years with her too. After enough drama, I agreed to go out with him. I couldn’t stand him and drank too much, I drunk texted her with his phone when he was asleep, his phone was about to die so I moved the chat to my phone, as in texted with my number. Now she texts me when she wants to text him and I don’t know how to get out of this.