Background: Split up with my ex in 2000. He walked out on me and DS1 and DD1. Not seen or heard from him since. Kids now 16 and 14. I was a single parent for a few years but have been married to my lovely DH since 2009.
Today, out of the blue, EXP sends me a message to say he would like to see the kids and form a relationship with them. This is after 13 years of non-contact where he didn't give a toss whether they had clothes on their backs or food in their bellies. AIBU to tell him to do one and that he is royally taking the piss?