Confused with a Relationship. Plz Help

Hi,

I am a girl who is in sincere love for the past five years. My Boy friend is more precious to me, he take care of me a lot, understand my thinking just from my face reactions and he means a lot to me. We were like very close and i share with him everything, no secrets in between us.

Then, one day i shifted to another company. I became more social than i was before. Gained a lot of friends. A boy came into my life and i started working with him officially. He only messaged me for the first time and i felt he was more different than any other guys who are my friends. But i never compared him with my boy friend. At the first day, we were messaging for hours. I felt little attracted by him charm and way of speaking. I told about this attraction to my boy friend. He told like this guy is dangerous, be careful kind of advices.

But he messaged me continuously. I replied. I considered him as my best friend not any other thing. We started talking. He talked closely at times in messages, i allowed that since i liked him a lot. He asked me to come out repeatedly. But i never accepted that at any cost. That times, he literally overreacted for everything, getting angry for some friendly comments too. Avoided me literally without replying to my messages. But i never let him go away from me by saying repeated sorries and forgiveness. This gets repeated again and again. And now he is breaking up the messages with me saying i hurt him at times and i am not like what he thought.

I also agreed. But now i find difficult to forget him. I know he is not respecting my reputation and avoiding me for some reason. I cant understand what the reason behind that. When i look at chat history, i remember the chats with him. I cant take him off my mind. i considered him as my best friend for life. Please let me help get out of him, since i feel like thinking about him is itself a harm, which i am doing to my boy friend. Waiting for your comments.