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It's not fair to put words in her mouth and thoughts in her brain like this. My dad was in the bishopric for most of my childhood, and I was never the person you describe here.
It MAY be true that she will not marry him unless he converts. It MAY be true that she will be miserable with him and make him miserable with her.
He knows that is a possibility. But that was also a possibility if he had married a non-mormon.
For men, this will likely come after completing your mission trip, so in your early 20s at the earliest.
It is highly likely that she will pressure you to convert, and if you resist, she may resent you for being the barrier to her being sealed to her children.