Is this relationship worth it?

I’ve been in a 9 year relationship, no ring and no kids together even though I’ve expressed wanting those things. Recently I found out that he had hidden pictures and video of his twin brothers baby mommas boobs on his phone in a hidden photo album. They aren’t together anymore and supposedly she sent them to him to upset his twin brother. However at first his excuse for keeping the picture and video of her boobs because of curiosity and asked if I had ever fantasized about someone. The next day it was “my brother is building a case against her so I’m saving these for him as proof”. Interesting thing is these pictures were from 4 months ago. Why did he hide them and why didn’t he tell his brother? I feel so stupid even asking this. Is that cheating? And should I cut my losses?

Is this relationship worth it?
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