having a affair without knowing HELP!!

Okay I meet a guy in a night club and ended up having a one night stand (he was just so beautiful 😍)

Anyways we started to see each other and we become serious and he asked me to marry him, I was thrilled and then to find out we was having a baby was even better! I'm having twins 👍🏻

So basically when I was 6 months pregnant we decided to move it together but he worked away sometimes which I was fine about I didn't suspect he was gonna cheat on me, so I found out that he has a wife because his friends told me by mistake, he said "your better then the other wife"

I was extremely confused, so I went snooping which was true he did did have a wife and I assumed a daughter! Because they were texting asking when he was going to see the "kids" more then one, I was stunned 

I walked away at this point I packed my bags nearly 8 months pregnant and soon to give birth. 

And from stress and upset I started getting pains in my tummy lead me to go in for a c section because of the stress, I didn't realise that the hospital called his as my emergency contact of course he showed up after the births we had a boy and girl.

And so I said kept making comments like "you have already had this special occasion haven't you" and "how many kids you got now 6" he was Angry and asked where these comments from and I told him I knew he had a wife and kids 

He told me he married young and that he didn't have kids his ex wife sister died leaving his sister 2 young children to look after one 6 weeks old and one 6 years old 

He said he he had a temporary custody of them and she's trying to make him pay child support for them, he also said he is In the middle of getting a divorce and has proven this since.

But what am I meant to do with this situation I have spoken to his wife and she's horrible and bitter towards me for getting pregnant but I think it's because she can't have kids, I'm just really stressed out, I've asked him whether or not he wants to see the kids he said he loves them but seeing the kids will making things complicated in court, also his wife still loves him making the divorce easy as she's doing everything in her power to be his wife 

He's 24 

Help any advice 😭