Devastated

I am 23 weeks pregnant with our second child, a boy. We have a 3 year old daughter at home and have been married just shy of 5 years. This morning I discovered my husband has been cheating. I don’t believe anything physical has happened, but he’s been using a secret Snapchat account to chat with women. It still feels like cheating to me, at least an emotional affair. I am devastated and completely overwhelmed at the thought of starting a new life with a brand new baby and toddler by myself. What do I do, what would you do. Any words of encouragement would be welcomed right now 😔