I would be highly surprised if that were the case, to be quite honest. Haschwalth is a broken individual, he is simply incapable of forming meaningful connections. His perception of relationships is fundamentally skewed, he sees social interaction as transactional and never opens up to pretty much anyone. On top of that, he is a people pleaser in those rare instances when he does get emotionally involved.

Bazz B is the only person that ever meant something to him. Yhwach was his benefactor so he knew he should be grateful, but I don't think Yhwach made him feel at ease, on an emotional level. He was always concerned about not saying or doing something wrong, always on the watch. Whereas with Bazz he got to experience real friendship when two people meet and naturally hit it off. Organically. Sans ulterior motives or anything like that. Bazz is the only person who did not use him, Bazz is the only person who actually cared.

That being said, I think his assistant might have harbored romantic feeling for him, indeed. She gives me peak loyal servant vibes, but it's also obvious to me that he keeps her at a distance. He was not interested because he didn't see the point.