Growing ovarian cyst that’s not going away?

I just had an ultrasound showing a 3cm right ovarian cyst and a year ago it was only 1.5cm. Also in just three months it’s grown about .5cm. I’m having increasing pelvic pain as well. What does it mean when it doesn’t go away and just gets bigger? All of the ultrasounds in the past year and half have shown this same cyst.