Does misaligned serpentine belt cause it to slip off?

I have a 2007 ford fusion 2.3L with 90, xxx miles. About a year and a half ago I had the belt changed because I had a leaky axle that was slinging greass all over it causing it to squeak and it's was the original belt so I guess it was time for a new one anyway. Everything was fine up until about 6 months ago, I had a idler pulley that was in bad shape causing excessive noise replaced by a friend that works on cars and we just reused the same belt since it's fairly new. All was fine until a month or so later I began to get another squeak and I had no idea what is, not bad just on start up but after awhile of driving it goes away, I read online I may just be a misaligned belt so Ignored it for the past 4 months and this morning I get into my car start it and a hear a wword noise immediately after I turned the key and my battery light came on and lose of power steering, pop the hood and belt is off all the pulleys. Strange how traveling over 70+MPhil daily going 100 miles away for months nothing happens and simple start up takes the belt off. Any ideas on if I should get a new belt? Or does tightening pulleys make a difference? Does misaligned serpentine belt cause it to slip off - 1

Read these two posts. Sure sounds like a bad tensioner to me

http://ricksfreeautorepairadvice.com/diagnose-a-belt-tensioner/
http://ricksfreeautorepairadvice.com/diagnose-belt-noise/

I would guess the tensioner is bad.

Spin all the pulleys that the belt goes on to find out if one of them is bad. It will feel gritty or dry and may actually flop if you try to wiggle it in and out. Did You ever take care of the grease leak on the axle?

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