Ex wants to all of a sudden change our custody agreement

I have a 9 month old daughter. Some stuff happened in court when we went for custody arrangements when my daughter was 3 months. I don't want to talk about it but the judge gave my ex full custody and I get 1 weekend a month which is Friday -Sunday. My ex lives in Kansas. I live in Georgia. So he flies out on a Thursday. Stays in a hotel so I can have my daughter for my three days and they leave Monday morning once a month. Honestly it's worked fine up until recently. He told me that the plane rides were causing my daughter to get a lot of ear infections and wanted to change things where I fly to them one weekend a month since I have family in Kansas. That sounds dumb and like he just doesn't want to put in his effort. The custody agreement was working fine for 6 months and he wants to change it now? Plus I have a boyfriend who wouldn't want me flying out where my ex is without him and I'm trying to respect my man. Now he's saying I'm being difficult when it's in the custody agreement that he flies out daughter to me. He is wanting to change things because he doesn't want to fly. Why should I have to move how we do things because he doesn't want to deal with ear infections. He wanted full custody and now he's upset with what that entails.

Edit: Lmao! Y'all don't know anything about my custody agreement and why it is the way it is. Doesn't matter because my daughter is taken care of 😘. Kids get ear infections all the time. Half y'all part time moms got your kids in daycare getting ear infections

Edit: For all y'all with something to say do you say the same things to fathers who have their kids fly out to them over the summer? Kids have been flying out to their fathers for years but because I'm a mother I'm held to a different standard.