Cheaters

My husband of 8 years cheated for 4 years behind my back,two days ago I went on his phone and seen a weird number, now I was never a wife who didn't trust him so I just ignored it until I looked again and someone was talking about the kids and the girls miss him and when is daddy coming home which surprised me since we have 2 boys and 2 girls together and they are 7 4 and two are 2 and my husband never really was gone all the time but a couple of times I remember waking up early and he wasn't home and then went to the credit card account and seen multiple charges for toys and diapers other groceries that we don't need. I found out that he has been dating this women and has created a hole new family I confronted him and all he did was say I want a divorce, I'm also pretty sure I may be pregnant again I've had these symptoms with my other kids and now I don't know what to do this is a little to much for me I'm only 28 and I don't know what to do I have a full time job and 4 maybe 5 kids and I'm really not sure how to deal with this