I've been through it for 5 yrs... just ended again 1 month ago, he always wanted me back, and me like a dumbazz was there... kind of think the same as u, used me for comfort, until maybe something else came along. Well it did, 2 weeks into being "back" I found out he was pursuing his new nieghbor, but said to me lets take a break... well fast forward till now he is with her and could careless if I fell of the face of the earth!! And I have to see it every day, they live right near me...
When he had or has no one, he will climb mountains for me, but when he thinks there is a chance with someone else " he needs a break" please, it makes me so sick to my stomach that people can be so self centered for so long and use such lame excuses according to their day.
I'm not sure who was the bigger idiot, me for loving him and trusting his words or him for playing me like a violin for so long... it just all sucks, I feel bad for u, it sounds like you are so hurt and only time will help a little.
Some people make love so hard and confusing, and they enjoy using people I think...