I've namechanged.
My son is 23 and I brought him up alone from when he was 6 months. We moved abroad when he was nearly 2. When he was about 10 we moved back here so we could see my eldest more often. He also started seeing his dad more (he saw him whenever we came to see my eldest). When he was about 15 he wanted to live with his dad so I let him. As soon as he moved in with his dad he changed and started being like him (getting into fights, getting angry alot etc where as before he was always quiet, sensitive and well behaved) and he refused to see me because he hated me even though I didn't do anything.
Now I still don't know what to do as he still gets into fights etc. Can I have advice please?