Ok, so I've never really posted on a site like this or anything, and I don't know if I'm even right about what I think is going on.
This isn't about me. This is about someone I care for very very deeply and my concern has been growing.
I'm not really too educated on symptoms of depression or any other mental disorders, which is why it's easier to come here and hopefully get help from someone else rather than endlessly google things (which i've done) but it's difficult to pin down.
I'll try to make it as short as possible -
This is about an ex boyfriend of mine. We started dating about 8 years ago on and off. We are in our mid 20's now- so when we met we were very young. He has always been the life of the party, funny, great personality, and a blast to be around. I love him very much.
About 4 years ago when we broke up one of the many times, he told me he was having issues finding himself and that he hopes one day i'll understand his struggles. He could never seem to stay with me longer than a few months and then he would come up with an excuse to break up or run away from me. However, I know he loved me dearly and I would always be extremely confused as to why he kept leaving then coming back, and the cycle repeated.
This went on for years, but now the last few years we have drifted, we see each other maybe 3 times a year, rarely speak. When we do, though, he tells me how much he hopes we can work things out one day and how much he loves me, misses me. Anyway, that's not what this about.

I ran into him at a bar a week ago - he was extremely rude to everyone around us, he said completely inappropriate comments to my friends. An example.. my grandfather is very sick and passing away, which I told him.. his response- "What can I say, he's dying, he's going to die" with no emotion in his heart. That's just one of many, he would say downright rude comments directly to people. He is always drunk.. 9/10 times i've seen him he has a drink in his hand, and tells me that he has been drinking too much and is drunk.However, he managed to be all over me like usual telling me how much he's missed me, etc. This is not the man I knew a few years ago. He has driven drunk many times. He hit the side of the railing on a freeway one time, with me in the car. He is reckless and doesn't seem to care about what will happen.
I wished him a Happy New Year with which he ignored and responded with a completely rude, irrelevant text.
The list could go on. He dated two new girls in the last few years only for several months, which he seemed to not be into at all, but rather using them as a crutch or boost.
He's always tired, and he can sleep for a day at a time. I would have to drag him out of bed.
Anyway, the reason i'm concerned is because he seems to be spirilizing downhill to where he won't even talk to me anymore, he has shut everyone out, and people are beginning to dislike him because of the way he acts towards everyone.
He makes angry comments that his family doesn't care about him (which I've never known to be true) and his Christmas was terrible, no gifts, no fun.. you get the picture. No one seems to be reaching out for him and I don't even know if this sounds like depression or just not a nice person. If anyone has any input or advice, i'd really appreciate it. I'm very worried as his reckless behavior seems to be getting worse.
Thank you for taking the time to read this.Sorry it's lengthy.