That's what happened to my BooBoo.He got out once then whined all the time for more.We take him outside for a walk down the driveway and in the yard 10 minutes a day and he seems satisfied.If we don't take him out for a long time..the whining stops.They kind of exept the house again.Just play with him more and he won't think about being outside so much.
Eventually the whining MIGHT stop.LOL
good Luck.
My BooBoo is 15 so I can take him out with him not running.
I'd try to keep him in and make him forget about in time but it's up to you.I know it's hard.