This could also be deom possession. I heard a story just yesterday at work with someone with the same symptoms. If you could find some godly Christians to pray over this person who love the Lord and hae a lot of faith, that would be of great use. Most people don't believe in demon possession now days because many people don't believe in the Bible, even those that do believe in the Bible somethings think demon possession has just gone away. Yet it is still here, under the disguise of a mental illness for many people. I would definately seek Christian counsiling. I also would not advize dating this person as they have no good intentions for you. You may feel sorry or compassionate for them, but do not let those emotions cloud your judgment. In his current state he would only bring harm to you, your future children, and your family. I would highly consider what ive talked about here.