Fiancé wants to rush and get married I want to wait

We just had a baby two months ago and things have been stressful. My fiancé’s mom is in the hospital and he’s been really moody and irritable. We have been arguing more than ever and he threatens to leave a lot. Then, when things are good he keeps asking when we are going to get married because we have been engaged for over a year. I personally don’t feel into it right now! I want to be happy and excited about the wedding and marriage but right now I’m having a hard time getting over the threat of him leaving me. I don’t think it’s killing anyone for us to wait. I want to make sure he’s not going anywhere before I get married and end up having to pay for a divorce and deal with all that!