If I convinced my bf/gf to leave their spouse, will they ever return back?

I had this happen in my Sims 4 game. If your Sim is married as my Sims were they become divorced. Can they get back together Yes, they are back together and now have 2 daughters. you just have to try if you wish as you would in reality. If you go visit the cheating spouse its a choice one is Se-duce. that worked.🙂

It's all up to you. I think their traits would matter. Both were nice as far as their personality.

Hope this helps, I am not an EA employee I am just trying to help. So if it did help please grant XP points ty.