I've come to resent and even dislike my ex but I can't mentally picture myself with any other woman. What do I do?

There's virtually no chance of us getting back together and I wouldn't really want it either but I can't envision another woman who puts up with me and how generally undesirable I am.
I've come to resent and even dislike my ex but I can't mentally picture myself with any other woman. What do I do?
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