<human>: Im a 30 yr old female. I was in a long term relationship from 20-26 and he (now 32 yr old male) cheated on me a lot and I would always take him back.

After being broken up for 3 years we recently met up for a weekend due to a friend passing away. He has and lives with his new girlfriend of about 6 months.

He made passes at me over the weekend, I said no a bit but eventually gave in and fooled around and ultimately had sex with him.

Now I have become the women I always use to hate when him and I were dating and I would find out about his infidelities.

He was my first love and I have had a hard time getting over him before and it was a very shitty couple weeks after this past event.

I want to know if I should tell his current girlfriend about us cheating on her, or just stop worrying about it and leave it up to karma?

I dont want to tell her because I remember how awful it feels to have your whole world come crashing down and I dont want to be the one to cause her that pain (even though yes, I knew what I was doing when I gave in to his advances and I realize I have already caused her that pain).

Is there anyone who has recently been cheated on?  Would you have wanted to find out sooner rather than later?

I am trying to remember how it felt like when I was the one being cheated on but it's hard to put myself back in that position.

Can you give me the gist of the text in a nutshell?
<bot>: ! Do I tell my ex's new gf that she has been cheated on, or just stay out of it?