I could really go for some cheating plots, including but not limited to:
I know you’re cheating, but I love you too much to leave you so I’ll just try harder to be everything you want then you won’t cheat any more.
We’re both cheating on each other, but we stay together despite that because we both secretly love the toxic fight, break-up, make-up thing we have going on.
You know Ive been sleeping with groupies while I’m on tour again. You said you’d forgive me if I just owned up to it and now you’re yelling at me? I don’t eve know why you stay with me baby, but I love you.
I’ve suspected you of cheating for a while, you always smell like their perfume/cologne, but I don’t know who they are. Then I meet your coworker who smells just like you do when you “work late”... care to explain yourself?
A while back I accused you of cheating, but you denied it and we got past that because I trust you. Now you’re pregnant which would be fine except we’re lesbians! (Or I’m sterile!)
Speaking of pregnancy/baby plots... I could go from some of those too... Like the following:
What? No! We can’ have a baby now! I just started working fulll-time/got a promotion/am about to go on tour/lost my job/adopted a puppy
We’ve been dating in secret because you’re famous/my sibling’s best friend/my boss, but thats going to be hard to keep doing now that we’re having a baby!
I haven’t seen in you in like two years and you’re telling me this is our kid? We have a kid?!?! I’m a dad?!
No! I can’t do this any more! You don’t take being a parent seriously, I’m taking our kid and I’m leaving!
...alternately, I’m still pregnant and I’m leaving because I know you aren’t going to take this seriously.