I know bf would be mad to find out and if it was the other way around I'd be super pissed but would you consider it cheating.

I dated bf a few months after ex dumped me. It was not a good breakup on my end. We haven't had contact since. He blocked me on everything. About 9-10 months later (I was with new bf for about 5 months or so) ex texts me. We talk nothing sexual or anything at first. He asked for a picture, I did send him one but I was fully clothed and laying on my couch in a relaxing way not a "trying to be seductive" way. He did bring up our sex life we had when we were together. I got caught up in the moment and only told him we shouldn't talk like that after I got the feeling he was just horny and lonely hoping we could hook up. We never talked about hooking up then but did want to meet. He knew I was in a relationship. We stopped talking only after his friend found out and started to text me basically to leave him alone but she was super nice about it and nothing came off like she was being a bitch. I still had some of ex's pictures and the engagement ring he gave me. She agreed to come to my work and pick them up and I blocked him from every way to contact him. Bf knew he texted me but not how long we texted or the inappropriate things. I have not spoken to ex in over a year. Also should I mention it to my bf or...? I do not love ex anymore (or at the time of texting) and would never get back with ex. Advice?