I need some guidance

I used to work with someone that I ended up having feelings for them. We both parted ways after quitting but we were really close at work. We occasionally game together whenever we have time but where I work, its a dead zone, I can't send or receive messages. Its been a really long time since we last chat but I still think about them, l've been keeping my distance, hoping my feelings will dissipate but I've been thinking about them alot lately and I wanna know, its been over a year, is it okay to send a message now? Telling them I miss them and have been thinking about them?