Ex partner was diagnosed with adhd about 4 years ago. He has the impulsiveness, inattention, and hyperactivity components. We are separated over 6 years now but share dc. He was, and is, a complete fucking nightmare to deal with.
He will go through short periods of feeling invincible, on top of the world, and will be the life and soul of the party. In these periods he's great fun to be around, and seems like a regular, happy go lucky guy. People gravitate towards him and he has no problem making friends. These up periods are punctuated with horrible dark periods, where he is critical, spiteful, depressive and just plain nasty. He will will actively seek out people to pick (verbal) fights with and can create conflict from thin air. He will also become completely unreasonable, it's like all logic and reasoning flies out the window. He will also burn down his entire life and all the progress he made during the 'up' period, so quit his job, leave his accommodation, end his relationships, etc. He'll spend a few weeks/months in this misery then slowly rebuild himself, usually by latching on to a new girlfriend/friendship group and get them to help him by crying and playing the victim.
When we were together this was an absolute head fuck. It took years for me to recognise the cycles, and it had a lot in common with the cycle of violence in domestic abuse, so honeymoon period, tension, crisis, and then back to honeymoon. There are a lot of additional factors, he has an all consuming weed addiction, is incredibly manipulative, and has massive narcissistic traits. He latches on to people, shape shifts to make them like or fall in love with him, then he'll use and abuse that person before moving on to the next. He has no shame when it comes to asking for money and favours or portraying himself as a helpless victim. He's incredible insecure but also hugely arrogant and entitled.
So plenty going on there. I still have to deal with him on a regular basis so it would help to know exactly what it is I'm dealing with. He'd be open to seeking a diagnosis I think if it was bipolar, so mood stabilisers may be able to help. I know only a doctor can diagnose but I'm curious if anyone recognises the traits.