I don't know you, but I fully understand how you feel. I recently had a bad falling out with someone I thought was a close friend who I met from here. This person was someone I considered my best friend so it was/is extra painful in comparison to the countless other "friends" who have come and gone from this place.
It sucks and it does spoil your view of this place and the people here for sure, but not everyone here is like that. I have been here for a lot of years and have a few friends who have actually stuck by me. Know that the few who stick by you make it worth it.