I had triggers and movies for years while married to a serial cheater.
It wasn't until about a year after I left him that the movies went away. Now it's been two years, and I can't remember the last time an unsolicited movie crossed my mind. (And I'm still trying to divorce the SOB, so that's a big statement for me to make.)
It's good now. It takes a long time, but once you separate and work on yourself and start looking forward to the future, you find yourself in a new place with a new outlook.
Three months is too soon. Right now I hope you can just take care of yourself and find a therapist or other trustworthy person to talk to. Hang in there. Life gets better - much better.