u/existential_oatmeal

So I broke up with this guy around 3 years ago. We ended on very bad terms, and I swore to myself I would never associate with this person. In a very cliched turn of events, he recently joined my company (the one I've been working in for the past 4 years) in a different department (I'm in HRD). Now, he's been sending me weird, uncomfortable texts over WhatsApp and Slack under the pretence of work talks. Moreover, even in the office, he keep passing me uncomfortable comments about my clothes and keeps tabs on me. I feel very unsafe. I am not sure if a mere complaint would help, as I want him out of my office space. Help me out, please!