My married male co-worker has this bad habit of flirting in front of me - whether it's on his phone, or eyeing up my female (married coworker - who talks about her husband but doesn't wear a wedding ring). He talks very loudly in my workspace on his mobile as if to flirt/make plans on his phone and get attention from me. I have no designs on him, but find his attention seeking behaviour is a pain in the butt when I am trying to work. Sometimes he is nice, but other times he's bloody weird. I came back from pneumonia after a month, and all he said was 'there's bugs in this building' and walked off. He says that he's coming to events I am hosting, then cancels without saying anything about it afterwards. Other times, he's staring at me which is uncomfortable. He's invited me to a couple of socials but I declined. I get on fine with my single male coworkers. The female coworker is pretty but wears revealing clothes to work, doesn't wear wedding ring, talks about her husband, but also talks a lot about how everyone thinks how hot she looks. These two sometimes come into work together and are constantly on their phones at the same time. I do not need to see a lot to see a pattern. Whilst I'm working for a living, I wish the man in particular would be self-aware of his eyeing up people (which has included me). Any advice?