KK and I are in agreement on this, although it would be fair to elaborate a little on the 'ultimatum' issue.
When you give an ultimatum - "Commit or Quit", for example - be prepared for the other person to take the 'Quit' option. After all, the terms of the ultimatum include an escape clause, and a person who is feeling pressured into commitment may be more likely to call off the relationship than to cave in to the first of many ultimatums, if they're smart.
I also hope that you get a commitment from this guy, but unless it originates with him (and not through an implied threat of a break-up), the 'commitment' won't last forever.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.