What are some "motivations" that spurns attraction for another, other than physical?

The manner of expressing your question is a bit unusual and puzzling. I sense that something has come up that has sparked some level of interest on the part of one but the other says “No” or otherwise backs off. To ask that question of amateurs may yield replies from irrelevant, to wrong, to dangerous. So consider especially carefully anything coming from this channel.

If this occurs within marriage careful probing is the place to start. Do your best to avoid conveying pressure to “perform.” There can be health issues. There can be factors from past history, current events, or other fears. Especially for a woman fear and some uncertainties are big turn-offs. There can be factors that come with mid-life. I know from my background that sex itself or even gender associated topics can be off the table for discussion.

If your question is in the context of an unmarried relationship then the fundamental matter of propriety comes into play. If the “spurning” person is one who holds firmly to sexual aspects of association belonging only to marriage then that is to be expected, respected, honored, and cherished. An apology is in order for even (deliberately or not) venturing into that territory.

There is a lot of context not in your question.

How that person carries themselves and how that person treats you is very important. If a person grew up in abusive home with an abusive parent, then they would be attracted to someone who is abusive subconsciously. Not because they like abuse but because that is the type of relationship that is "normal" to them. People in general have a hard time getting out of their comfort zones even if it is for their better. People are attracted to familiarity.