how many chances do you give the person you loved that cheated and lied to you

me and my boyfirend been with each other for 6 years or more. 2 years ago i found out that he cheated on me two diffent times. now he he saying that i love u. i wanna marry u. but he dont want to do it now right . he said in 2 years we wil. i dont know if i can trust him anymore. would you ?