Mmmm sounds suspicious. It maybe a mojo or a doll or the likes. Sounds like Hoodoo to me.
A - Where do you live ?
B - Check your house for ‘things’ - under your bed - back of drawers everywhere you can think of.
Think back - has your ex been in the house SINCE you split at any time - to collect his stuff or the likes ? What nationality is his new partner ? She might be doing it without his knowledge, may have buried something or powered your pathway or such. Clean your floors with florida water let dry, salt the corners of each room then sweep out exiting the room - do all rooms whilst saying the St Michael prayer - until out the front door Sage your house again say the Michael prayer. Usual cleansing stuff. Check for the planted mojo or effigy doll or the likes.
Its designed to make your life a living hell - negative negative negative. I know the feeling.
A simple egg cleansing may work (search there are loads of references) - (this wont work for long if you have a hex bag doll or the likes in your house - it will come back. - you need to find that bag.) Think about when you split up - the curse could have been BEFORE you split up in order to make you split up (perhaps something your ex brought home with him one time which you still have.) Salt your bath water - bathe before bed.
Again I say if its a doll or hex bag or the likes (anything that was even gifted your ex and/or something that he brought into the house when you weren’t there, and is still there) you have to find it and get rid of it. It might also be in your car. Meditate on this and ask for spiritual guidance maybe your ancestor spirits, you will find it, it will just come to you as to what it may be.