Most Helpful Girl
all relationships have their rough patches hun.
you can either work through your issues and try fix your relationship with her by talking about your trust issues and insecurities. maybe she can try and ease your mind and prove herself.
if that doesn't work and you still feel things can't get better, sit her down and talk to her nicely, explain that you dont think its working and you think you two should end it.
at least then you can look back later down the line and know that you did actually try to fix the relationship before ending it completely.