Questions: Break Up & Divorce

I've been in an on and off relationship with this girl for 5 years. It always ended because of her religious difference. She went on a mission a few years ago, and recently came back. But we had plans to marry before she left and she did a lot of harsh things to me on her mission.
When she came back I was hoping things would be different, but no. I finally confronted her and got my closure on the situation. But we had a similar run in a few years ago, and she was going through major life transitions and took it out on me.
She used to stalk my social media when we weren't together and it seemed she was when she came back, but she denied it. But I blocked her on everything but Facebook.
I decided to unblock her for some reason.
Would she notice?

I'm having trouble getting over a girl who I was with for about 6 months. I lift weights but had been slacking a little while I was with her. Would it be a good idea to get into the gym again. My goal is something like the physique Brad Pitt had in Troy or that of Chris Hemsworth. Half to spite her, half to prove to myself I can get that shredded.

This is just out of curiosity of how you ladies feel when a guy sleeps with another girl.

Yes - advantages

Punish that prick he won't ever do that again and he will become your slave for life

No - advantages

Never see him again

Please vote and comment of why you chose x

I heard from mutual friends that she hit up her ex flames after we broke up and got together with one of them who was still single. Now she posts all this lovey dovey shit of them going on trips together on instagram. It really breaks my heart how she could move on this quickly. We've been together for 5 years