No apologies necessary.
It is a common-enough problem to fall into, driven hard by the culture and the extremely easy accessibility of porn these days. It is also a fixable habit, as many CAF members can attest to from their personal experience. As humans, we all sin. I don’t think you should reject a potential husband because of a porn problem in the past, but you should insist that the problem be absolutely in the past, without lingering recurrences. This will mean that you will have to be able to discuss openly this type of uncomfortable subject.
As far as finding a husband without this problem, I would recommend looking within the church for someone with strong core values in other areas, maintaining an open dialog on spiritual/moral ideas, and actively supporting the growth of the marriage relationship by Engaged Encounter, Marriage Encounter, and professional counseling as soon as problems develop.