Blind sided

About 3 weeks ago my husband told me he didn't know if he wanted to be with me (granted I'm 7 months pregnant). I found out he had been seeing someone else as well. Sunday he told to get my things and he wants a divorce. I cry all the time and am getting depressed and I'm so sad that my daughter won't have the life I've always wanted for her. I'm trying my hardest to stay strong of Emma (my unborn daughter) but it's so hard. This was the last thing I ever thought would happen. I honestly thought we were happy.