Your Views list shows members who have viewed your profile in the past month. If someone no longer appears in your views, there are a couple of possible explanations:
They are no longer on CatholicMatch - if the member returns within 30 days, they will reappear in your views.
One of you placed a block - the view will not appear unless the initiator removes the block
The view occurred more than 30 days ago - the view will reappear when the member views your profile again