So feeling for you
Of course it's hard, and can take more time than you'd like, especially if you were together for quite a while.
I don't have anything helpful to offer right now, except that from experience I can tell you that IT WILL PASS. Soon enough you will look back and recognise that there have been gaps where you haven't thought about or pictured him, then you will see that those gaps are getting bigger, and one day you'll discover that you're free of him!