Sorry you're having a bad day K. It really s**ks when that happens.
Have you considered getting a written agreement on visitation and support? When my H decided that our "trial separation" was going to become a permanent separation we had an agreement prepared which specifies custody, visitation and child support amongst other things. Of course it sounds like my H is being much more amicable than yours, but some sort of agreement would give you some protection. Our agreement specifies that I have sole custody, with H having unlimited visitation provided 24 hours notice is given. I've only once had to turn down a request and that was because my son was already committed to attending an Army Cadet exercise.
Stay strong!
Both 50 S14 M 16 yrs (his 3rd; my 1st)
ILYBINILWY - 24 Dec 2012 H moved out - 27 Jun 2013 Legally separated - 6 Sep 2013 Closing the door and changing the locks