Hello HurtOne: Well... I don't know if there is any particular behavior that one could generalize as being "normal" for depressed men. What strikes me here is, for one thing, misery loves company. And, since your former bf is miserable, & it sounds like this girl he's involved with has her own issues, they may be just coming together based on their mutual unhappiness. Also, it sounds as though it's mostly her putting forth the effort; not your former bf. She may still be more-or-less new to him now, & something of a novelty... which I think is frequently attractive to most men. But, in the not-too-distant future, he may well drop her the same way he appears to have dropped you.

This is probably not what you want to read here. But from what you've written, I would say, in the whole scheme of things, you're probably better off without this guy. A weed-addicted, depressed bf is probably the last thing you need... especially if you have a tendency toward anxiety & dysthymia yourself. If you simply can't get past this alone, then some individual therapy around the concern may be appropriate. But, one way or the other, my perspective would be... this may be a blessing in disguise. (Hope this doesn't sound overly harsh.) I wish you well...