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I was wondering more about the happiness/wellbeing part than the my terminal goal part.
But about that: it would mean it's one of my terminal goals. I'm also not seeing how it would be incompatible with a "transactional relationship".
I feel there's an intended connotation that it should rank high among his terminal goals (in the example, high enough that he shouldn't end the relationship), but this doesn't necessarily follow from "seeing her as an end in herself".
(I think the "intended correct answer" in the scenario is that he shouldn't want to leave her in that situation. This is compatible with him wanting to stay for her sake, but also with him wanting to stay because he would still enjoy being with her. This latter possibility has a better claim to being a healthy relationship than the former, and it's also entirely compatible with a "transactional attitude" as described by Salemicus)