My heart is broken 😞💔😭

I’ve been co parenting with my ex for 5 years and we do the 2-3-2 schedule alternating and everytime I get my son back he tells me all about all the fun he had with his dad and he’s always so sad to leave him and when my time is up it’s so much easier for him to just leave me and go to his dads he says that my house is boring because he has no one to play with and his dad and step mom have 4 other kids... he ask me all the time why he has to come with me and he can’t just stay with his daddy and it breaks my heart.. I feel like he doesn’t love me anymore. He tells me that him and daddy talked about getting full custody but his dad didn’t talk to me about any of this... I just want my baby happy but I don’t want to lose him....