Good luck, don't punish yourself, he has done enough of that. And remember meth screws up all your senses, it can even make u think you love someone you don't.
Especially if you associate the come down with being alone. It will feel even worse than normal.
Give yourself time away. And don't let him bribe you with drugs. Each time he does that he is treAting you like a who're, and paying for your time

All the best, and remember we are here if your hitting a low.