Really down

Hi guys so I'm sorry to write something that isn't happy but. I am just feeling so sad. My marriage wasn't doing well and I left so we could have some space because there was so much tension. He led me on to feel like it was all me and he had no problems in our marriage. We went to counseling a couple of times and around that time I was being really nice- bringing him soup and apples once, and inviting him to things with our daughter. Come to find out all that time he was trying date other women and sleep with them behind my back. He didn't feel bad about it , he said he just didn't "feel married so he took off his ring". Now I'm 18 weeks pregnant  with a three year old staying with my mom. I'm a Navy vet, and I just feel like I joined the Navy to have make a better life for myself and now I'm worse off than I have ever been. He quite his job and has only been going to school and using his gi bill but even that he hasn't been giving his full effort in. I have been stressing about finding a job and have had no luck. So far 2 turn downs, and a no call back. I sold my engagement ring so I could have money for Christmas presents which felt sad too. I just feel sooo down and heart broken and alone and worried and stressed and also betrayed. I told him I filed for a divorce and it almost feels like he isn't even upset at all.