Been divorced for 9 yrs since DC was a baby (XH had affair and walked out on us). Always asked XH to attend parents eve, school stuff and he usually has (although he's usually miserable, hardly saying anything to me), but I've put on a brave face for DC's sake. Now in a happy relationship (though only 5 mths) and DC likes new partner. New partner wants to go to DC's sports day and I'd like him to go to sports day. I know if new partner goes XH will have a face on, although he will have one on with me anyway. However am worried it'll cause friction and problems for DC. What would you do?