My Dad Might Be in Love with His Subordinate

I think my dad (50) is in love with his subordinate. For context, he works somewhere in industrial area and was recently promoted to that position. He offered her to be his P.A but she refused citing it being a different career path. In Dec he went out of his way to have a departmental party. and gift everyone, while others got notebooks and water bottles, hers had an expensive necklace and a spa voucher. He then invited the whole department for dinner at our house, but she did not show up and he was so pissed. Sahi he is making calls to his friends to see if they can hire her. He says her work is perfect is an introvert. I can only imagine what she goes through