Why does he just disappear?

Long story short, I live with this person and share two kids together. we are in a rocky relationship and I just started nursing school so my hands are pretty tied with the ability to just leave with the kids. I have to put up and have with a lot, other than the feeling of being “stuck” I would have left a long time ago. He randomly leaves and disappears for hours and I try my best to keep doing homework but I get worried, I simply don’t get used to his behavior. He leaves late at night about 2-3 times a month and has no explanation of where he’s at or what he was doing he just shuts me down when I ask. Or he has some lame excuse that makes zero sense. I don’t know what to do or how to cope I feel like I’m going crazy.

Why does he just disappear?
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