I was like this when I was younger, really controlling, aggressive and jealous and not a very nice person at all to be in a relationship with. For me it's stemmed from an abusive childhood and a feeling that I wasn't worthy enough for anyone to love me, so I wonder if your ss does feel that way because his mother abandoned him. This behaviour destroyed my first marriage. I would 'speak' for her so that I didn't give her the opportunity to say the wrong thing and worry me, so that I didn't have to deal with awkward uncomfortable feelings that made me depressed and angry. The one thing is that unless he gets whatever issue it is that has affected his self esteem so badly in relationships sorted out, this relationship will flounder. It took me a very long time indeed to sort my head out but I'm such a happier and far better balanced man for it and able to not feel threatened in relationships now.