Post partum depression or marriage on its way out???

My husband and I have been married for 5 years. We have a decent relationship but have created a marriage where we are very independent from each other. We both work full time and have a 4 year old and a 4 week old. I also lost another little boy April of last year. I definitely had some depression after that loss for a few weeks but was able to move on without counseling. During the time of my loss, my husband's friend (female) was texting him for sex advice and even went on to send him a text how frustrated she was because she just wanted to have sex and she wasn't getting it from her boyfriend. We weren't having sex at the time because I just had surgery. He also stopped wearing his wedding band at this time. I talked to him about both issues and he rolled his eyes and dismissed it. I have had some trust issues with him since then. So fast forward through the year, I got pregnant again and sex was once a week or once every other week, he still wasn't wearing his wedding ring and has been addicted to his phone. When I mentioned the phone time he again rolled his eyes and said well you used to always be on your phone. I'm now 4 weeks post partum and really sad. I feel like my marriage sucks. I'm not happy. I don't trust him. I feel like we are so independent from each other. He wanted me to go out Sat night with him and his gym friends but I wasn't ready to leave my newborn for a bar. Last night his ex fiance commented on one of his pics on social media and when I asked him why he was friends with her he said he didn't realize it was her. So long story but idk what to do. I tried to talk to him tonight and he just rolled his eyes like usual and turned everything back on me and said he didn't want to debate with me Please help....I know that we created this independence from each other it I really have trust issues now and when I brought up counseling he rolled his eye....