nightstalkerpoet said:

Vader believes that Obi-Wan is responsible for manipulating her against him,

All the more reason for him to not want to think about her again. She betrayed him.

Somebody who has taken to the dark side of the force is not suddenly rendered incapable of love

I couldn't disagree more. The fact that Vader found the love in his heart to save Luke is an exception and is what makes the moment so powerful.

At this point, I'm sure Vader wants to forget his former identity of Anakin Skywalker and he wouldn't want anything to remind him of it.