I kind of doubt that you committed mortal sin, but please take that up with your confessor. I’m just a dude on the computer.
I would also encourage you to not expect sainthood to be an instantaneous event. Many people I’ve observed who suffer from scrupulosity seem to have this belief that they should be perfect like the saints. The problem with that is that the saints weren’t always perfect. They sinned like the rest of us. Allow yourself to spend some time in the minors before you jump to the big leagues. Certainly one should strive for perfection, but perfection takes time and practice…for most a lifetime followed by stint in purgatory.
Also remember Christ came to save not to condemn. It seems to me He would be more impressed with what you are doing to improve yourself versus what you are doing to condemn yourself. So you watched a romantic scene on TV last night? The next time one comes on, promise yourself that you’ll change the channel. If you do…that’s improvement.
You’re a keeper in God’s eyes.
This article might explain what I mean better.
You are loved. Never forget that.