Haha... yeah, I remember having that feeling too. BUT *knocks on wood* I've never broken a string doing a bend... and sometimes when I'm jamming I get working my bends and my Trem pretty hard... like SRV/Jimi style hard. Just try it out on the G string... it would be the least likely of the three bottom string to break. Here's an example of what I was trying to explain earlier... This will help to train your ear to bend your notes and stay on pitch! Since a lot of people play guitar for years and don't realize that there is a right way and a wrong way to bend a guitar string... it's important to stay in tune.

First pluck the note you are going to bend up to (example... 9 on the B string). Then pluck the note you want to bend from (example... 7 on the B string). You can do the same thing on any string with any notes that are two frets apart... or even 1 fret apart...or you can combine a bend with a Floyd rose to learn how to stay in pitch doing 2 step and 3 step bends.

e|--------------------------
b|----9----7b(9)-----9-----

you should bend the 7th so it sounds just like the 9. This is nothing more than a little training excercise that you can do to train your ear. Remember that you don't HAVE to bend the string upward. if you feel more comfortable bending the string downward thats okay too... obviously you can't do this on the little e string... Hope this little thing clarifys what I posted before and I hope it helps.