Relationship problems

A month ago, I had my daughter, and I'm experiencing some postpartum issues and trying to adjust to having four children. My partner and I haven’t been getting along and just fighting since his mom got here, and again I’m just struggling though postpartum. Besides that, we haven't had a lot of conversation with each other since he came home. Well him and his mom decides to go on a walk which is fine I stayed home with the kids and got their homework done and baths, but when he came back home he and his mom had smoothie king cups in their hand so they went to smoothie king and didn’t offer to bring me anything, and of course it really hurt my feeling and maybe I’m overreacting about it but I went to the bathroom to take my shower and cried. I’m just struggling I guess. I just know I would have offered him something to eat or drink on bad or good terms. It really hurt my feelings.