I have reread the OP and vote for group home with Leed and Farmergirl. If you hesitate even for a second between marriage and a group home, then the group home wins. I am sure it is just a group home, not a prison - you can still be friends with your gf and hopefully have sex when you visit her (sex inside the group home is likely not allowed). So the practical component of the r/s will continue even when you are in the group home.