TL;DR - I casually dated with Lily for 8 dates, and during that time, I had an ONS with my ex. Should I tell Lily what happened or do I end things with her to spare her the pain of what I did?
I have been on 8 dates with this girl I will call Lily. We met on a dating app.
I really like Lily. A lot. But I made a mistake. My ex was visiting and she texted me if we could hang out. We did discuss the possibility of a FWB when we broke up but I did tell her at first that it wouldn't be a good idea. But I was so stupid and so easily gave in by convincing myself that Lily and I were not exclusive, so it would be okay. In my mind, I was pretty certain that Lily was dating other people as well, so I thought it was okay. But I'm also pretty certain that Lily wasn't sleeping with anyone. While I know none of you will believe me, it really was just a one time fling for fun.
At the very least, I truly don't recall having romantic feelings for my ex, but I do acknowledge that I could be lying to myself.
I have cut and blocked my ex and I deleted the dating app. I want to be exclusive with Lily, but I know I mucked things up too much.
I have three options in my head:
1) Ask Lily to be exclusive and ask if she wants to know about my past. For me personally, I truly don't care and don't wanna know about Lily past before we were exclusive. But I feel this is a cop out so I might just tell her instead.
2) Tell Lily what happened and have full transparency about anything she wants to know. If she wants to break up, I will accept it and still be honest with her.
3) Breakup with her while we are still in this early stage to spare her the pain so she will think it was just an incompatibility issue.
What do you think I should do?
Again, I know I'm a bad person, I just want to know what to do right by Lily, no matter what happens.
That was poorly phrased, I mean, I don;t expect people to believe me, so if they don't think I'm telling the truth, they are free to do so.