help please

i have made a big mistake. my guy broke it off with me because i have trust issues and i am working them out with a therapist. i asked him if when i get through therapy, in 23 days, if he would start over with me. he said he would get to know me again then, however this is not a guarantee and there is a chance he might change his mind. how do i deal with the constant hurt and anxiety for the next 23 days? please help me