[F4A] Loyal girlfriend cheats in the worst way imaginable

Not looking to be some dumb slut in this, but a sweet and loyal girlfriend who is going to be seduced and manipulated into cheating and betraying her boyfriend in the most fucked up ways possible. Please offer up your thoughts and ideas but here’s a couple of ways it could go:

1. At a funeral with my boyfriend after his sister was raped and murdered. He knows who did it but he’s too powerful to convict. You decide to show up to offer your condolences.

2. Moments before my wedding my boyfriend’s abusive father or my own estranged one shows up uninvited or cuts in on our first dance as a married couple.

3. After being raped I was understandably traumatised. I hadn’t had sex with my boyfriend for months, but that night keeps replaying in my mind

Please no “hey’s” or “DM me”. You’re wasting your time