He cheated what should I do?

[Sierra]

I posted a similar question about this situation but I haven't gotten that great of advice so im hoping I will this time. So my boyfriend of 2 years cheated on me a few months ago and I just found out Saturday. He and my friend had phone sex and now Im really really hurt about the whole thing. Ive never been cheated on and hes my first love and everything else. We were 16 when we met. Hes made so many mistakes but I stayed with him because I believe in him. I really love this guy, more than anything in this world. He always promised me he wouldnt cheat on me even though he cheated on his ex. He swore he wouldn't. He still did. Now im having issues trusting him and Ive been crying for days. I told him Id stay and give him another chance but if he leaves me, we're done. Do you think I made the right decision? Do you think we can ever be happy together and do you think I can trust him again? Also Im pregnant so im having his baby which makes things all the more complicated.
*If he cheats on me we're done
Firstly, fapping to another woman's voice is cheating. Secondly, I didnt do it to trap him, trust me. If I have to trap a guy for him to stay, I would get myself a better guy who wants to be with me.
And him asking for naked pictures of her is definitely not being faithful to me.