He’s probably telling you that you’re a good mom bc you associate a good parent household with two married parents and therefore he’s basically manipulating you into thinking well i’m a good mom so i should be married.

please know that you are a good mom no matter what and you are still young and can definitely re marry with a guy that won’t cheat on you. The issues you described (of him feeling like you aren’t the same) will only get worse with time as you mature as a mother and he doesn’t mature out of a childless man mentality. A divorced household with happy individual parents is much better then a married household with miserable parents