Not sure if I'm posting in the right place.
DS (11) has recently cut almost all contact with xh.
Background - divorced when ds was 2. Always been acrimonious, although more from his side than mine. He has contact alternate weekends and half holidays, indirect contact whenever but usually twice a week. We live approx. 1 hour apart.
For a long time I have had to make ds go when it's his weekend to be away. At half term he should have been away for the week but he lay on the floor, refused to get dressed and begged not to go. When I text XH to say he didn't want to go XH just said fine. Then XH refused to take DS's phone calls and sent him a manipulative e-mail (I'm so hurt, how can you do this when you're supposed to love me? etc) XH is still refusing all contact.
I think DS has been building up to this for years, every bit of contact has been agreed in court and it's always been said from 11 he can decide for himself. At home he has me, DH and DD, all his friends and a fairly typical family life. At XH's he has XH and current GF. He says they drink a lot and aggressively question him about us, take him to the park late at night, odd things/ They don't get up until about 11 but he isn't allowed to get anything from the kitchen himself. XH has cut all DS's contact with GP as XH and GP fell out (my ex mil) since before Christmas.
Now it appears that XH has recently been convicted of drink driving and lost his license for 2 years. DS found out by reading about it online. 
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I've tried to stay out of it but it seems that DS is beginning to see how manipulative XH is. Should I encourage him to make up? Or leave it for them to sort out themselves? DS says he would like to talk to him, but doesn't want to stay again for a while. Is it cumulative or was there an incident I haven't been told about?
All opinions welcome.