Easy to lose faith?

Why is it so easy to lose faith in God? Why do we not see that God holds us when we fall down?
Why don't we believe that he is there..
Talking abt this friend of mine, who's utterly pained these days for thinking he is a failure. He says he's lost, he's drowned. I tried to make him understand, but to no avail. guessing a person forgets the brighter n better sides of things when he sees the gloomy side of it...

But why? Well yes, certain things aren't the way we want them to be. But still, there are other things in life worth caring for. Well, probably it is hard to look for a direction when things aren't right...
why can't he see the opportunities that are still there??

We always move on, but we find it hard to admit that. We hav to...

Well pain is not the question, it is its bearing. It is painful I know, but feeling pained doesn't help to make us feel better.

I don't know why God doesn't make us see Him, even when He is there...

It is so hard to accept the hard facts of life - that somethings are simply meant to be, and somethings are not the way we want them to be. We lose what we want at times. Why?

If He gave us these pains, he also gives us strength to overcome it. But why, at times that strength isn't enough for some of us? It hurts to see our friends n family in pain. Praying to God to help all those who don't want to fight and go ahead, coz they've failed...