You're not alone here...my husband doesn't get my alumna involvement as well...especially as his dad is a TKE and his sister is a XO..both of which have not continued their participation as alumni...my husband will begrudgingly go to my events too when I ask, but what's hardest is most of the women in my group don't have S.O.s so he ends up being one of 2 or 3 men who attend...as a result I feel bad for him and don't force him to come with me...I ask him, if he says "no" I don't press it. It's his choice.
What's even more funny is how much it bothers him that he doesn't know my ritual...I won't tell him anything about the symbols, ritual, NOTHING!! He'll be cute and ask questions, trying to trick me into telling him, but I won't budge...his reasoning is that we're married and I shouldn't hold secrets from him...is that a guilt trip or what?? LOL...he doesn't hold it over me, but it's cute how he'll try to finnagle something...