That's because I have been hurt by you before. And I can't just sit by watching you hurt another one by one. Aren't you sick of getting into Relationships/friendships just to spoil them in the end?

So you're blaming me, whoever-you-are, that I'm the one causing all breaks in the relation/friendships that I get myself into? Yes in the past I was the cause, but you're not giving me the benefit of a doubt that I may be the one hurt?
And you honestly think I want all this to happen? Whoever you are and if you want to talk, you can just contact me, since you know me and I know you.

its better to know, than assume. So ask;