Jake, I hope you decide against spreading your ex-girlfriend’s spy cam footage. Not only is that mean, you could also get sued for a lot of money by your ex gf and landlord.
Just drop everything and completely forget about her, easier said than done I know, but it’s not worth it wasting any more energy on these people. Let them be together, they won’t be able to build any meaningful relationship together and they will soon get sick of each other.
You are lucky that you found out your ex girlfriend was cheating on you while you’re young. At least you didn’t have to waste your time getting married to her and finding out in the future when you’ve already had kids that you’re married to a cheating wife.
Forget about them and focus on your own life,