I'm not sure it would be normal for him given that he was also married?
If she wasn't with him and he was with a girlfriend then his alibi of messing around with her and friends some where away from home would get him in the doghouse with her (maybe she already knew he cheated though if that was the case) but beig seen far from WHF would provide a good alibi.
I still want to know where exactly he said he was and who all the people who provided alibis were.
It would put an end to the speculation about his alibi not being so solid.