STBXW might have been having an affair, and I don't even care?

Just realized my STBXW might have been having an affair. Pretty good chance actually.

But for some reason, if true that is, it might even come as a relief because in some twisted way, it might validate our upcoming divorce (which was due to different reasons).

Also, the fact that she may have someone to be with rather than by herself helps to alleviate any guilt I may have.

I'm not even interested in digging deeper anymore. I just want it to be over.

Is this a sick way of looking at it?