Never trust a person who has let you down more than 2 times. Once was a warning, twice was a lesson and 3 times is simply taking advantage. Gotta remember this! Why waste time with a person who isn't a.friend at all?
I know that sounds strange, but I fear loving another for just that reason - trust. If the same thing were to happen ever again, I truly don't think I'd be able to come out the other side like I did before. let's just keep it simple, shall we?