Should I stay

Mistty
Over a month ago me and my boyfriend broke up  and kicked me out the house and I went and I kissed another guy and I stay the night at this guys house we did not have sex me and my boyfriend got back together and I didn't think it was important to tell him that I kissed another guy and ended up finding out about it and we ended up breaking up again because he said that he was just mad and that I should not of taken him seriously when he said for me to get out his house and that I cheated on him and when we got together this time he told me that he wanted to get our own place and that he wanted to marry me But I was no longer allowed to have Facebook Instagram Snapchat or anything. He said I had to earn his trust back and that he did not do nothing wrong he said that I deserved it he also said that his ex-girlfriend was better than me and that he was single for two years and I he can go back to being single again that it does not phase him and when I told him that it made me sad he just shoved it off. Also he ended up having sexual relationships with the girl next-door and lied to my face about it I just want to know if I should trust him this time when he saying he's changing and that me and him deserve to be together when all this is happened