Anything to do with the ex? Just a thought not accusing.
Set some CCTV up on your car it's not expensive to do now. If you have a camcorder and a VCR you can do it off the mains and just use a 4hr tape and set it to long play. Give you 8 hours of cover just need to remember to set the recorder each night. Have you got PIR security lights? If not get some they are only £10 from Argos and are a doddle to fit and set up.
Did you get my PM?