My Ex-Boyfriend shows signs of depression, what do you think?

My Ex-Boyfriend and I are still really good friends. Months into our relationship I noticed signs of depression, and I don't see things getting any better for him. He is 25 years old, has no friends other than people @ work, and sits home all day playing Final Fantasy Online. Now that I have a new boyfriend and spend less time with him, I still worry about him being alone...he could do anything. He says he's depressed because he is overweight, and he's now taking diet pills with caffeine pills. I'm not so sure that's healthy...so when I confronted him about it he got very defensive. What I don't get is when I talk to his mother about it its like she doesn't care. Ever since he's been taking depression medication he's almost bipolar. What can I do to help since his family won't?

if you are still spending some time with each other, and both are ok with it, why dont you do something to help him his weight? i dont know, what you do, when you are together, but what about goint to a swimming pool together? swimming is the best way how to get fit, you will spend time together, and he might find a new hobby.

Talk to his doctor and sign him up for therapy. Thats the only thing that helps
Have you ever thought that your the reason he is depressed? Sure he told you that its ok and you can be friends, but have you thought about how he really feels about that whole situation. he probably still has strong feelings for you and when you come around its probably very difficult for him to manage. I had a very similar problem and once the women figured out that I wanted to be alot more than friends, no matter what I had said before, she left me alone, and everything is just fine and dandy now. Also, his parents probably arent receptive to anything you say because your probably one of the main reasons why he is in the shape he is in. Sorry.
I agree with the second guy. Being dysthemic (a form of depression) myself (I've learned to accept it) and 24, I know how crappy it is to see an ex happy and myself still stuck where I am and not being able to do anything about it. It's a no-win situation for you and your ex. I suggest you bring it up because he won't. It'll help him vent some things out and you can compromise on what works in your relationship with him.

If you want some advice on how to help him feel better about himself, I find that going to the gym helps. I eat like a slob, I smoke, but I still go just to get some frustration out and I feel great afterwards. For example, today, I went to the driving range and then hit some weights. What also helps is finding a direction in life. I'm in law enforcement, but I'm also trying to find other ways to get a side income. I sell old, dust-collecting stuff around the house on eBay, and I play poker live and online. Hope all that helps.