Firstly you have my sympathy b/c I too am living with my children split between uni, my H and me. There is a possibility that in the near future I may not have any of them (thier choice) and it is tearing me apart. So (((((((((hugs))))))))
Secondly you DID NOT make any mistakes IMHO you just tried to do what you feel is right for your D16. I only wish I could say the same about my H.
You are a very special man. Never forget that
Me 43 XH 45 M 2.7.88 Divorce 7.10.09 Kids D20,S17 & D15