Why is my boyfriend so moody?

He's been so moody, about his car but it's getting fixed. Somebody scratched it up, he's getting it worked on early instead of June. I told him about my cousin that fixes scratches, but he went to his coworker's recommendation instead. Anyway, he's been moody for the past couple of days, like he's hot and cold. I understand his car got messed up but I'm letting him drive my car at the moment so at least I'm trying to help. What do you do about a moody boyfriend?
Why is my boyfriend so moody?
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