You're not being very specific so I'll just be all over the place and hopefully somehow make helpful sense.

Thing is everyone is gonna hurt us in some way at some point, its not completely avoidable. But obviously there are certain types of hurt caused by very specific types of people (example betrayal) who are best avoided.

The simple fact and act of caring makes us vulnerable, which unfortunately means we then have the ability to hurt, and the people we care about have the potential to cause said hurt.

That's why forgiveness was invented, nobody is without fault and ideally nobody is beyond redemption.

We need to be very picky and choose which people are worth it though.

I say the following because you haven't elaborated on anything:

For me, (and I hope for you) I NOW write people off if they repeatedly hurt me. Like why say sorry if you're gonna screw me over in the very same way tomorrow? You suck and I'm a sucker... no win situation.

But if its someone who made a mistake (as naturally I have too) then I wouldn't just write them off first time.

I hope you use a similar type of method to weed out the rotten apples.

It sucks to be completely isolated. For me, I made a mistake in those 2 years, I wrote off people who didn't deserve to be discarded like yesterday's news. So I mended the fences and rebuilt bridges where I deemed neccessary.

If your weeding has really left you with nothing but discarded rotten apples then I urge you to take a look at what drew you to them in the first place. After you've done so, it would be wise to then examine what types of people would make for better friends, and then set out to find them and cultivate frienships with them.