hOW To MaKe A MemorY loST 4eVEr??

If you have any method please tell me.. cos i am facing this problem now.. i know dear not able to forget things that he mind.. keeping it make both of us unhappy but problem is losing it.. How? how to make him forget and will not get angry when talk about sth that might link to "him"...
Everytime i said to him.. it is all my fault should not be angry of him.. but it seem just get the hate off him.. i am out of ideas.. and everytime when talk to this.. we will be unhappy and i chose to avoid.. "tao bi" everything .. dun wish to talk or even say.. cos i am tired..

I am a FAILURE.. i fail to make my dear to make him love me and trust me again.. fail to give him all the hope he need.. i guess what i did is more hurt than now what i try to compensate.. failure of me.. sometime i will tend to think.. does he chose to hold me back becos he wanted a revenge or "bu fu shu"... i hate guessing.. even though a lot of thing which goes into his mind i dun need to think too much.. cos.. i always know what is on his mind.. ... it happen a lot of time le.. WHat i should do?? I know "li kai" is not a good solution.. but What more i can do? Tell me??