I've personally loved someone, but realized that being with them was mentally harmful and had to make the decision to part with them. So in my opinion a relationship with someone is completely voluntary. While parting from someone can be extremely difficult, it is still a voluntary action, just like quitting smoking or going to rehab.
Sneezing is something I would consider to be involuntary.
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"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
-Dr. Ian Malcolm, Jurassic Park
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