1996 Mazda Protege won't start

I turned the car off and took the key out when I opened the door it was like I left the key in the ignition the alarm was going off. I put the key back in and closed the door it stopped. I opened the door and took the key out and the alarm went off again as if the key was still in with the door open. I closed the door and the alarm went off so I went back to work, I came out 4 hours later and put the key in and nothing, no click nothing. I tried to jumper cables, nothing, I tried the lights and they were at full strength. Nothing else works. I did have a back-up key made the day before and thats what I was using. The ignition switch feels loose in the tumblers. It does have a remote start, that was installed years ago. Any ideas?