well after being away i came back and checked all my sites as normal and on facebook i had a private message. i opened it up to find a message from my ex fiance

i havent spoken to him for over a year apart from to say leave me the hell alone.
basically on my 30th birthday sadie was taken seriously ill so i didnt go out, i stayed home and my mate and her hubby came round with a bottle of wine. he called me and had a go at me for not giving him my undivided attention and laughing with my mate (her hubby had just put her top and bra on so of course i was gonna laugh

)
anyway, not once did he ask how sadie was but 2 of my ex "boyfriends" called me and wished me a happy birthday and asked after the kids. when i said how seriously ill she was, 1 came round and the other waited for my text about the doc visit at 4am even though he was working at 8am! needless to say i told my fiance he was a selfish possesive jerk and my kids come first so i ended it.
anyway, we should have been getting married next month and all of a sudden he has sent me this message saying he misses me and asking how we all are.

i messaged him back saying i have been ill (not gone into detail) and the kids are well but growing fast and that i hope he and his mums are ok cos i was close to them.
his profile says he is in a relationship so why on earth is he contacting me now?
mark will go mad about this! mark isnt really a jealous type but does get annoyed at the fact i cant hold grudges even with exes who have treated me like a doormat. i believe everythin happens for a reason and had he not treated me the way he did i would have been engaged and not with mark!
sorry i just dont know what to do. i have tried to be polite without being too friendly and i havent added him as a friend but i just dont know what he is going to say next. the kids were really close to him too but that just makes it harder to break all ties
what would you do?
xx