I cheated on my boyfriend with one of my close friends for 2 years and i feel terrible about it i finnaly told him about it and were working things out but i just dont know why i did it i know it wasnt because i was drunk. I just want 2 know why i did it?

You did it because you wanted to.

I can't guess what your specific reasons are, but I have some thoughts on it. Maybe you will find yourself amongst them, and it will unravel the mystery for you.

Most of the time the reason people cheat is that they either don't understand the importance of good communication, or they do understand it, but are unwilling to go through the "hassle" of it. Perhaps they are lazy. Perhaps they aren't that invested in the relationship. Or maybe they are afraid that, if they do, they will reveal a part of themselves that is so painful that they don't want anybody to know about it.

If it is the latter, we have another problem. The person honestly does not realize (or doesn't believe) that thier monsters in the closet are nowhere NEAR as big and scary once you fling open the door and shine the light on them!

Sometimes, a person is just so accustomed to failing in life that, to them, this is just one more instance they have destroy themselves, and blow their chances of happiness. It gives them another chance to stay in the misery they are accustomed to, rather than striving to get out of it. At least they are surrounded by something familiar. To them, that is a type of comfort. Why leave comfort, only to branch out into the known?

I haven't spoken of more severe issues, such as personality disorders and sexual addictions. Primarily, it's because I am not educated enough to speak on those subjects, even though they sometimes play a part in why a small section of the population cheats in relationships.

I do want to address one final thing for your benefit, and I hope it helps. Besides the unnecessary pain you cause another human being when cheating (as if that isn't enough!), it does a lot of damage to yourself, as well. It blows any chance you have of feeling good about yourself straight to hell. That alone might be motivating enough to simply not do it again. +5

You did it because you aren't ready to settle down in a comitted relationship. You need to spend more time as a single person.

I dont know for sure, but you could have done it because you were bored with your current relationship and wanted to find more adventure.

You needed/wanted more than what you had?

The fact that it lasted for so long tells me that you had a need of some sort that was not being satisfied.