Does he deserve me?

So me and my bf have been dating for 3 years we starting dating our freshman year of high school and we are each others first for everything. I recently found out he had been cheating on me with some other girl over snapchat for about the last year of our relationship (she's out of state and he's never met her) after I found out about her he of course blocked her and promised that'd he'd never speak to her again. I asked if I didn't please him and he tells me that I do please him and he loves me very much but she has bigger tits and a bigger butt than I do so he just wants a different "experience" for a change. Which is understandable since he's never been sexual with anyone else. I just explain to him that i'm sorry that I can't look like that but he tells me that he loves me for me and loves me for my body. I've been really insecure about this, and I also too want to know what it's like to be with someone else also so am I crazy or does he not deserve me?