Glass screen protectors for iPhone 6 keep braking?

So I keep buying these glass screen protectors of my phone and they keep cracking! This is the 5th one I've bought and it just cracks over nothing! Havnt dropped it, haven't been rough with it, havnt tamperd with it. I got this one about a week ago, dose anyone think I can get a refund? Like there about 150$ here in Canada!

Are you putting your little phone in your back pocket and sitting down on the phone?