Do all men cheat?

Me F22and my boyfriend M23 have been together for over a year now. I asked him what his plans are for the future. He said he doesnt see a future with me (living together, kinds etc.). His reason is that i had one partner before him. Yet he doesnt want to break up and says he loves me and doesnt think he would find a better match, but this is just how he sees it. He said we could do all of that if I accept and allow him to cheat on me. He said all men think like this, and all men cheat. Is it true? I feel worthless, like im not enough to be his wife and mother of his children. Beside that he said that im the perfect girlfriend. I told him if he thinks he can't see a future with me, we should break up and that he should be the one that breaks up with me, ao that I can cope with it better and it's hard for me to just go because he is my first LOVE and I dont know what to think and do. (Sorry for the grammar, english is my 3rd language and please be kind I'm already sad :))