Girl I previously dated a year and half ago called me out the blue? what does it mean?

Anonymous
Late tonight a girl I am still crazy about called me out the blue. We dated for a while but she ended it with me because she wasn’t ready for anything serious at the time due to some things going on in her life. However she did say I was the perfect person and it wasn’t a no for anything ever happening in the future. So a year and a half has passed and I was thinking about her today. Next thing you know I see her number calling me. It didn’t ring for long though, maybe 5-10 seconds. I didn’t pick up. I assume Saturday night she might be drinking or a pocket call. Or just a mistake. I don’t know what I should do. Should I message her back and see what’s up?
Girl I previously dated a year and half ago called me out the blue? what does it mean?
4 Opinion