I never thought he would be end like this?

im 23, and in relationship for 2 years. when i was 16 i had playful relationships here and there for couple years. let's call him B, we used to have a long distant relationship, until i broke his heart one day by dumping him and got with another guy in front of him when he finally made it come to see me. i was too young to understand what i did by that time, that i suddenly came to realize that i was really bad. i chatted with B last few days, and it's been 7 years , he still remained single. i kept teasing him, n at last he got angry and said it's because of me! i was surprise, he said since then he never ever want to try to have one. he felt an extreme heartache, and it's because of ME! and now.. he seemed hard to move on. he's really a very nice guy and ive been really careless with his heart. i dunno what to do. he kept convincing me he'd moved on, but he acts like he hasnt. what should i do? get away from him? but i really feel guilty!