I think i lied to my gf...what can i do?

well the 1st time i had dated kayla i had lied to her then and thats why we had broken up...but 3 months later we had started talking again and everything was soooooo PERFECT!!!!!!!! and i hadnt lied to her the whole time we had been talking... but on the last day of june one of my ex's, trish, had txtd me right after i had asked kayla out and was spending time w her...and of course kayla was buggin out a lil bit bcuz i had lied before about having with trish...and i had told trish tht we could be friends but it was limited to jus tht...well the very next day trish calls n talks to kayla about me n her having after me n kayla had broken up...well kayla flips out and starts asking me why i didnt tell her...and to be completely honest...i had completely wiped my memory clean of having w trish cause i knew what i had done was very bad so i tried my very best to forget about it afterwards and i did...but now kayla doesnt talk to me...hell she dont even acknowledge my very existence and she says that she thought i had changed and i could talk to her about anything...and now i dont hear from her by phone or myspace xcept every once in a blue moon...i cant sleep, i cant eat, the stars are gone, the once beautiful colors have all faded to blak n white, tastes have gone, and it just seems like the world just isnt worth living in anymore!!! im so lost and confused without her, especially knowing that it was probably my fault....WHAT DO I DO???