Mind is really the master. Your presumption that he is not born again is the basis of all these issues you have highlighted.
Every baptised Catholic is born again because what makes one born again is being Baptised for Jesus said " unless a mam is born of water and the Spirit, he cannot enter the kingdom of heaven. " I will really like you to change your orientation about this issue.
Secondly, I am surprised that you that claim to to born again and active spiritually is the one that has failed to pray about your bold into marriage. You perceive relationship with God in prayer as something you have to do according to one pattern and method. It is not until you have fasted or gone to a mountain that you have prayed about something. Prayer is a conversion with God.
There are many ways to converse with God, some go to the mountain, some shut the door to their room and pray, some go to quit places, and so on. All these forms of prayers are found in the Catholic Church, and not just one pattern or method of prayer that you find in other places. Don't lose a precious man because of lack of understanding, seek clarification about that Catholic faith that is unclear to you.