Sorry you lost your umbrella. And the whole stress of going back there and not find it.
Personal I like the foldable umbrella. It's really convenient and portable and I can carry it around anytime I go out. Due to how hot the whether here can be and my poor eyes, I use it to shield from the sun mostly and when rain falls suddenly, I'm never stranded. So I'm always careful not to forget it at home or where I go to. It's now a part of things I go out with.

Here's a suggestion: Get use to carrying the umbrella around and using it. You can hold it in your hand or put in a bag or purse. Soon, you'll not forget it without noticing on time.