I know that he battled depression about 3 years ago when his dad passed away. I didn't know him at the time though. He also has periods where he is down for no apparent reason. I feel like the past few weeks/months have been like that due to stress of switching jobs and moving. I am not sure if this is just part of his personality linked with ADD, or maybe something more like bipolar.

His house is usually messy, and he has trouble finishing tasks. When he broke up with me, he seemed to blame me for everything that went wrong in his life; his ADHD mother who drives him crazy, his OCD sister, our playful banter that he never had a problem with but suddenly considered that as annoying bullying, me trying to help him with household chores but suddenly he considered that as interfering with his life and criticizing how he does everything wrong (I have never said or implied that! I just did those things the way I usually do, and he just let me).

Since these thoughts that he was having didn't seem realistic/accurate/true and since they seemed to come so suddenly, I was thinking in terms of depression or possibly bipolar because of the 180 he made. The week before, he was talking about marrying me, and he booked a ticket to come see me. One week later, he didn't feel the drive and connection anymore and wanted to end things because of the reasons above.

Is this depression? Or maybe something else?