i have changed my high e string about 4 times i the past month.
ive also noticed it breaks at the bridge every single time. (it breaks when i bend)

what is the problem and is it common and how can i fix it?
The high e is extremely thin so that could explain it but i dont think that's the problem. Sometimes, when the string snaps in the same place every time, there could be a rough edge or a sharp bit on the saddle. Just check to see thats its smooth, if you're still not happy take it to your local guitar store and they'll help you out.
ummm probably sounds like a sharp saddle. just go over that saddle spot with some wet/dry sandpaper and it shouldnt happen again