As I've been dating my boyfriend for about 9 months now and we've started to begin to understand each other and love each other more day by day but some reason I wreaked it and turned it into havoc, I've lied and lied, argued and argued throughout the months about stupid things and in conclusion I've hurt him constantly throughout the first months we even dated. This is with other boys, flirting and such as it just makes me feel so stupidly cold inside and now just recently I told him that I don't know if I ever will stop lying to him. As he over reacts and then we argue some more, now he's left me and I've broke his heart as he has given me so many chances, I just now don't know what do to :/

Read the stickies at the top of the forum and rebuild your life without him. Learn from your past mistakes and make those adjustments in the next relationship you have

I told him that I don't know if I ever will stop lying to him. As he over reacts
Thats what you should have told him, the reason why you feel you have to lie. That doesn't excuse your behavior with other guys though.

and then we argue some more, now he's left me and I've broke his heart as he has given me so many chances,
You blew it, and without knowing his side of it, the trust is gone, and thats the consequences of lying.

I just now don't know what do to :/
Stop lying as this will break any relationship you have. Deal with the truth and those consequences as for whatever reason you lie, you miss a chance of dealing with the real underlying true facts of the matter.

If you lied because of the way he acts, then be glad he is gone and you can move on to someone who you don't feel you have to lie to.

That doesn't mean your behavior is any good though. If it was as innocent as you make it out to be why lie anyway??