Do you believe in curses?

I feel like someone has cursed my pets. I had a falling out with a friend last year who ran a non profit animal rescue thing. Ever since then we've had terrible luck with our pets. We have not gone more than a couple of months without one of our pets dying. And in all the years we've had pets, we've never been plagued with such heartache. And it literally started after our falling out. Do you think it's related? As currently stands, our one cat died suddenly in April, our one bird died in March, and another cat in December, and another bird AND a dog in August last year. And currently another cat of ours has been missing for three days.

Or am I just mad?