how to deal with boyfriends unpredictable mood swings?

My boyfriend has unpredictable mood swings, on a weekly basis he will usually have a more than pleasant 3-5 days, for those days things are wonderful and I feel truly happy. Then out of no where his mood changes drastically, sometimes his eyes look red and veiny, sometimes it looks like his pupils are dilated (they look empty), its not unusual for his mood to be physically noticeable. while sometimes I can relate to why he may feel depressed, the extremes between being fun, gentle, and caring to nasty and unresponsive and agitated, startle me. My personality is on the opposite side of the spectrum, I'm sometimes too aware of other people's feelings and will only express my moods in a conversational tone rather than allow my behavior to reflect my mood. It may be that im just not understanding some people can't control how they behave when they're down , but from where I stand it seems selfish that he thinks it's ok to be mean just because he's not feeling great.

It always turns into me trying to be nice and him disrespecting me which is a pretty bad feeling, so clearly my methods aren't working, what actions should i take (or not take) when he's being moody?
we're not breaking up.
 
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