I work in a small company (~10 employees). A few days ago my boss asked me to get his credit card from his car at the parking lot. This happens, from time to time, so I can make some purchases for the company. After the last time he came to me and said that money that was in his car is missing and that I must have stolen it, because no one else has access to his car. Of course I didn't and now he is noticeably "cold" to me. We had a very good relationship - friends I would call it. But now he is avoiding me and accused me of stealing and said this to other employees too.
What can I do in this situation? I really want to keep my job because I have many freedoms here and it's very well paid, but I also want a "normal", respectful work environment again.