Just accused security guard of stealing

A month ago, someone broke into my car and stole a bunch of stuff and my garage door opener in our apts, (which is not attached to our apts.) They got into the garage and took a few things. I went and got a new remote from the apts (they said they reprogrammed it) I have been wakeing up and just checking out the window. Tonight I wake up and go to my garage and see that it is open and the light is on, now that light will go off after a few minutes, so I knew either someone was in there or just left. I ran downstairs and looked into the garage. There was no one there, so I thought maybe my wife left it open and a cat or something ran in there.

I saw 3 guys walking in the distance, but they could of just parked and were walking to their apt. Well, I went upstairs, walked to the kitchen table, grabbed the remote and walked to the window and shut the garage door. I was telling my wife what happened for like 7 or 8 minutes. She went back to the room. All of a sudden I am watching out the window and I watch my garage door just open on its own. I run down stairs and I see the security guy (who drives through our apts like twice a night.) turning in front of my garage. I ask him if he saw it open. He gets out of his car and says no that's weird. I drove up at it was already open. I looked and saw no one else around (the remote does not have a long range). I told the guy well, I'm just glad that we have a camera installed so we can figure this out. Right then he got really weird and got in his car and was trying to leave. I could see it on his face. He then kept saying he didn't break in. I sad I never said you broke in I'm just saying how weird it was. He called in to his dispatcher and said I was accusing him of stealing. I called the office, right away the guy started telling me the guy is a senior patrole officer and that he wouldn't do that....... I don't know he seemed so guilty