My ex is refusing to set up regular contact with our 2 children (14 years & 11 years). We have been separated for 8 years and at first contact was sporadic and on his terms but then about 4 years ago he committed to a regular routine. So he used to see them every other weekend from then up until March 2020 before covid hit but then seems to have used covid as a reason not to see them regularly. I have repeatedly asked him to got back to the every other weekend arrangement but he has refused. Instead, he just wants to flit in and out whenever it suits him. My children are really not happy about this and I’m often comforting them as they feel rejected by him. Now it’s getting to the point my 14year old doesn’t want to see him and says she doesn’t have a bond with him anyway and my 11 year old doesn’t want to see him by themselves so won’t go if their sibling refuses to. I really want to tell my ex to leave them alone and not see them again unless he is willing to commit to a regular routine as the inconsistency is just not fair on the children. Can I do this or have I just got to sit back and let him come and go as he pleases?