Found emails on boyfriends laptop?

I was looking at my boyfriends email and I found a message in the sent folder calling another girl gorgeous and that he would be on to chat later that night. I started to feel suspicious so I looked onto his social network profile and found messages from girls telling them about his *ahem* manhood and asking advice on an EXTREMELY personal thing we are going through at the moment. I have just found out I am pregnant and he has told me that for my health problems (which are quite serious) that we should really consider an abortion. Yet he has told these girls that he doesnt see me as the 'ONE' and thats its a shame if I do decide to keep the baby. We havent even told the ppl closest to us about this. I feel extremely betrayed and so hurt. I phoned him at work and said to him I know all about the emails and he told me its not what I think, so I said NO, Ive read them ALL, and he just hung up on me. I feel like throwing out of the home we share together. I dont know what to do.