Men, when irritable is it best to leave you alone?

mssexy
My boyfriend tends to withdrawl from me when he's irritable or in a bad mood. but this makes me feel like I did something wrong. For example: he has been dealing with several car troubles which he paid and thought it was fixed. Turns out the problem returned. When I arrived at his home he didn't talk to me or pretty much acknowledged I was there. So I tried talking and he was short with yes no responses. What is the best thing to do in this situation so I can avoid feeling like I'm at fault fro his mood swings but also letting him he can count on me for support or whatever he needs? I don't want to me nagging or desperate either. Help...his moods swings are driving me nuts especially because I don't know what's wrong,
Men, when irritable is it best to leave you alone?
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