It is your decision but if you want him back in your life, use a phone call or meet in a place where you will be safe and the first order of business will be to learn why he changed. If it was religion, see the staff at the church. If he had medical help, have him give the doctor permission to open his records to you. If he just said he changed and that's it, run away as fast as you can. People do change but when they are like that it takes a really good reason and much effort. You must know the truth about him before you allow him back in your life.
Good luck because you already have enough to deal with and then having this added to your problem list.