If there's anything I could tell you, it'd be that "Shit happens." It happens for a reason too. Either it's to protect one's well-being and future that awaits them, or the fact that either one of you really deserves (and will find someone) better. Time is the key, no time to dwell on "past mistakes".
Idk what kind of relationship you guys had, but consider that you don't own him as a person I don't see a problem. It may be painful, but unless he's hurting you intentionally then forget about it.
It sounds like he was a douche to begin with. His reasons and actions are major jackass-status. I've never been in a relationship before, but some ppl didn't want to near me when they found out I had drastic allergy reactions; it's been like that all my life and most of the time, they were assholes from the start. Try not to be too worry about it too much. I'm sure you'll find someone else who will see your heart before your health :)
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