No other choice but to breakup?

Sorry for the long post, but i really need your opinions. I've been seeing this guy for 4 years, although when we met, it was clear to us that this relationship was a dead-end, but we enjoyed ourselves for as long as we could. recently we decided to put an end to it, for both our sakes. My question is, how do I get over all the history we have together? I can't seem to see other guys, and I'm literally more attracted to a potato than any guy I meet. there's no way we can be together again so can you suggest ways I could regain some interest in dating?
No other choice but to breakup?
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