i may have screwed up more in my marriage..

Yesterday he came home from work and told me he wanted a divorce. Well I basically freaked out and said "if you leave, I'll make sure you never see Nicholas again" I seriously had a bunch of thoughts going in my head less than a second, the thought of being a single mom scares me so much(my mom raised us on her own, I always seen how much she struggled) I know I sound horrible, Bc who am I to keep my son from his father. He said he would would want to do 50/50 & getting money monthly without going to court & I said "no you're the one that's leaving so you don't get to see him" after more arguing he said he didn't want to go anymore. So I basically just scared my husband into staying with me. I know I love less marriage is worse, but I always said I would never be a single mom.