I caught my new boyfriend talking to other girls, meeting new girls and intense contact with his ex. what do I do?

lalalaurenness
I am in quite a predicament here. I am in a new relationship and the boy is very sweet, caring and seemingly invested in this. However, I had to shut an alarm off on his phone and of course saw a pop up message from another girl regarding feelings and wanting a relationship. I knew I shouldn't have opened it but I was already becoming suspicious, a gut feeling. I wish I didn't snoop further, I should have respected his privacy. I noticed intense, high emotion texts to his ex girlfriend, new girls on tinder, pictures of him half naked, telling other girls how "stunning" they are, etc. I was extremely hurt, feeling lead on. I confronted him, and he states it was nothing. my take is that he could have shut this down with his ex instead of continuing to discuss getting back together. also, new girls on tinder? he never struck me as a person who would engage in these types of behaviors. I'm very angry, and he is desperately asking me to come back. I do feel is was right to leave, but I care about him so much and thought this was going to be "the one". am I wrong for leaving? my trust is now diminished. I feel now as though everything he said to me was just as "it was nothing" as the other girls. fake... I don't know. advice please?
I caught my new boyfriend talking to other girls, meeting new girls and intense contact with his ex. what do I do?
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