Wow you could be me. I haven’t been diagnozed beyond generalized anxiety disorder with occuring depressions, but I have long suspected I’m bipolar, the only thing holding me back from pursuing it is that my «phases» aren’t that severe. They will be sad enough to not get out of bed, but not enough to feel suicidal. Then excessive happiness for a period, but not quite manic just a very strong positive outlook. I had no idea there was a less severe form of bipolar. I also happen to be in a long term relationship where the exact same cycles happen. Too depressed to be social, girlfriend needs social stimuli so goes out without me and I get jealous feeling like I can’t function like a proper boyfriend. Because I know from experience how exhausting it is to deal with a jealous partner I hide those feelings from her and pretend it’s okay, of course she can tell somethings off but figures I don’t want to share, and so we get those chapters where we drift apart. We always drift back together once I get up on my feet, but it has worried me for a long time that at some point we may not.