Unexpected breakup

So, we just started dating 3.5 months ago. I found out I saw pregnant in August. At first he was very supportive and wanted the baby (he was overseas in military training).. He said he wants to be with me, and is happy.. we even discussed getting married... . 2 weeks after he gets back to the states, he starts to get distant and detached... He says he wants an abortion now, and thinks the relationship is too early, but assures me he wants to still be with me... however, He doesn't initiate conversations and when he does tall it feels forced... 2 days ago he said he feels constrained and overwhelmed... says he is okay with us dating other people. Should I give him space or just disappear?