I'm depressed...
I failed my friend, badly.
We both don't feel like living today...
He wanted advice, so that he could confess to a girl, and I told him to just do it, and say the truth and he did that, but she said she didn't like him. Well it wouldn't be bad for me, but my friend is overreacting by a whole lot. I feel responsible for this.
After all I encouraged him.
I hope that his "I give up on world" will pass...
Ouch.
My advice: If he's old enough to drink, take him out for one. Nothing helps like liquid confidence, and a good friend to drink with, to help get over it.
Caution: Moderate it. We don't want any accidents or asinine behaviors to occur. This is only to boost his confidence back up, and give him a good buzz while at it. In that form of depression, verbal advice or standard cheer ups won't work. Alcohol, on the other hand, is quite effective.
At least, in my experience, it's hella effective.
Let's hope he can grow thick enough skin in due time if this is going to be a common result (like my case. I'm a veteran in this department. No success to record as of yet. Getting a date, that is.). It's like one of my design teachers said "When you get out of here (after critique), you'll either come out with thicker skin, or need therapy.". With that advice applied, I'm a
Muton. Can't get thicker skin than that. Especially when you're so familiar with rejection (and it gets so predictable eventually, when you think about it) you won't bother asking anymore, and have enough confidence not to give a damn (which ironically, might actually attract more women. They're weird that way. No luck yet on my end though, so I can't confirm that yet.).
My advice to him: Get over it, get used to it, and enjoy your solitude while you still can. You'll miss the days of the freedom you currently have while you're single (it takes time, but it's damn worth it. Count your blessings while you can.). With every rejection, you might actually grow a spine to confront issues more, especially when your ground is challenged (when you're no longer single). Last thing you need to lose is your manhood.
When you eventually look back at how you used to be in the past, you can see the same flaws others see, but don't have the guts (or heart) to tell you when you ask. Personally, a real piss-off point for me. If someone wants you to improve yourself, why aren't they harsh enough critics to point the real flaws out? It just delays positive results.
I hope this helps, unlike how many other shmucks would give (non-)advice elsewhere; or outright insult you like mad (on- or offline). I speak from experience. Good Samaritans, which also give decent advice, are a rare sight to see these days.