If you were the one who left your ex, regardless of the reasons why, it might be a good idea to brace yourself for potentially oppressive waves of guilt.
Not guilt for leaving them, but for feeling partially responsible for the ensuing chaos that followed your departure. You must let go of that feeling; it’s futile, all consuming and serves no purpose other than to elongate your pain.
Instead, try to focus your mind on the fact that you are free of the situation that caused you to leave in the first place, there may well be a few details to clear up regarding your collective worldly chattel, but you’ll get through it.
However difficult you think the immediate future might be, hold onto the fact that you’re over the hardest part.