I am sure Tom wanted the lizard out of his apartment.
Why did Tom want the lizard out?
He was used to living without a lizard and he thought it wasn't fair to keep it inside if the lizard was uncomfortable.
You shouldn't bring pets into an apartment without talking to the people you live with, as they might have problems with pets.  It's understandable that your roommate does not want to live with a reptile, and you should respect his wishes.
I feel HAPPIER with the lizard as my roommate wanted it gone.
Well since you have the lizard now it all worked out. In the future, if you are not sure if a person wants a pet, ask them before hand to clear up any confusion.