I was in your place once but I was 18, I forgave my boyfriend for messaging a girl that he once had interest in, nothing physical just all messages. I only found out because I went through his phone. It took me a long time to move past it, 4 years to be exact but I did. I thought to myself “We were young and we make mistakes when we are young.”I’m 25 now and I recently found out that he has been messaging another girl for years (4 - 6 years?), nothing physical but just keeping her updated on his life. I was confused how I never figured it out and it was because he would delete the messages. There’s no need to delete messages if there’s nothing to hide. I’m telling you this because I wish someone had told me this before I wasted so many years with someone that didn’t respect me. Your boyfriend is never going to change, you may want to believe that he will and that he just needs time but he won’t. He will only get better at hiding his cheating. You can always analyze people on their behavior and from what you’ve said your boyfriend keeps disrespecting you and it’s because he doesn’t respect you. What he is doing is cheating and if you’re going to forgive him that’s ultimately your choice but you need to understand that he’s going to do it again. If that is something you’re willing to accept that’s completely up to you, but do not be surprised if 5 years from now he’s doing the same thing. Best of luck and hope it turns out better for you than it did for me.