DS (17) has got back with an ex after a break of 8 months. She's a liar, a sneak, she bullies him emotionally and is generally a head fuck. We, me and DP, boosted his ego, talked for hours, hugged and tried to make him feel better after he finished it the last time due to her awfulness. I did make her feel welcome, would cook and chat and even made her a fecking Christmas stocking. Even his friends don't like her - obviously she tried to keep him away from them (sigh).
DP wants us, me, to back off and let him get on with it despite both of our disappointment in this starting up again. I have to keep reminding myself it's his life and he's 17.
What would you do, oh wise ones?