how do i tighten my you no what?

um...yea... basically my man is in jail and he thinks im cheatin WHICH IM NOT, but he says if my vagina is not tight he will walk away coz he know i have been cheating, i have not been cheating, iv never cheated on anyone, but anyway... how do i make sure i dont have a bucket, (by the way i have been fucking myself, thats why i need to tighten up)