No way your ex should be anywhere near your home while you are away. I would most definitely change the locks. What I always did when I didn't trust that Chuck wouldn't try to come in while I was away (despite the locks change), was to alert my neighbours and let them know I was away and if they saw any strange car (including his) to alert the police that an intruder was on premises. I suppose if the house is still in his name, though - it wouldn't help.
Florida was wonderful and I want to be there still. Next year I'll go for longer yet.
Chuck must have been here. I found 2 checks in my mailbox. Now that's not hard to take!