This is hurting me so bad

When we started talking he was broken up with his girlfriend and we was talking for 10 months. He stopped talking to me for good idk why idk what I did wrong and it was bugging me. Today I found out he got his "girlfriend" pregnant and it hurting me so bad that he lied and how pretty much played me and idk what to do because I might be pregnant by him as well. It's just killing me inside truly bad what he has done to me :( what do i do? I don't wanna tell him, I don't want stress him. He already cause enough stress for me and i just can't believe how it hurts