so we bought prince his new exercise pen which is pretty big(takes up half my living room) and attachs to his crate so he can go in and nap whenever he pleases. hes really tiny & having him run around the whole house is scary so i thought the pen would be a great idea. well i put his toys in the pen and a blanket. i thought he would run around play with his toys and enjoy his new pen.. the problem is he doesnt want to play if nobody is playing with him.
i am home with him all day bc i dont work so i do spend ALOT of time playing with him and training him but if i have other stuff to do around the house he wont play.. as soon as i get out the pen he goes to his bed and sulks

i tried throwing a toy but he wont chase it.. he just lays in bed and watches me walk around the house. it really breaks my heart.. i want him to enjoy his pen even if im not there..
is this normal? do all puppies need someone to play with them?