I have to almost laugh....I could have writen this post....especially the paragraph that started "My problem is just patience....." That was me in a nut shell...
Okay, about the parent trip...have one final discussion and practice your NEW YOU...simply say "About the trip to your parents....what would you like to do?" Then accept his answer...if he says I don't know then say "Well let me know when you do, I marked the calendar so we won't forget when this is planned."...then definitely LET IT GO!...if he says to cancel or what ever and you need to call his parents...ASK him if he wants you to call them for him...leave the decisions to him...don't keep asking...don't try and clarify...just do it!
Your Vegas trip....if you feel comfortable going alone then you should do so...plan to see some really neat shows...go to the Lua it is really cool...drive out to Hoover Dam and take some pictures...do some FUN THINGS you can talk about when you get back...DON'T invite him to go....if he wants to go he will go... no questioning!!!
I know this is going to be hard...it was for me and well I think we might have been twins separated at birth, lol...but if I can do it...YOU CAN DO IT!!!