My Mouse

Like the story we read in class today i have an animal that i need to get rid of and have no idea who to go about doing that. Right when we got back from spring break there was a mouse cage in the PFM. I walked past it at least 12 times before i noticed some boys looking to kill the mouse. So having the big heart i do i saved him.....and hes been in my room ever sence.
Dont get me wrong hes a great mouse, he cute, doesnt make much noise, and sleeps all the time. Except at night time. There is a wheel in his cage that he believes he has to run in from 8pm to 7am and the thing makes ALOT of noise. Jess and i have had are fill and now i have no idea what to do with him. If i take him to the pet store they will sell him as food so i cant willingly send him to his death. I cant set him free in the wild because he was born and raised in a pet store. So im told.
No one has even been looking for him. It more or less seems that someone dropped him off and hoped that a sweet girl like me would pick him up.
I need advice. Please let me know what i should do with this mouse

PS. his name is Wheatley