I think "cool" describes his feelings perfectly.
If he did love her, his response would be different.
EDIT. Don't think INTPs aren't the type to send 100+ texts a day if they are into someone. We are only aloof when we're disinterested. Unfortunately, some of the guys seem to have this habit of keeping a woman they're not really into "on the back-burner" until someone better comes along.
I find that despicable.