As a guy, here's my take on it.

He likes you, romantically even I'd say (based on what you are writing, but then again, this is just your side and interpretation of things we are reading). Learn more about him as the above user said. Everyone has baggage, however, and don't judge until you know the person.

He may be gun-shy because of two things. One, he has a bad history with relationships. So bad that he's been on his own for almost a decade. An ****-storm breakup like that also makes men extra cautious and vigilant. He's likely taking a long-term approach with you. The second thing is the age-old adage "don't **** where you eat". I mean, he's doing a bad job- he's kinda farting where he eats right now by making his teasing, walking together, eating together so obvious. It's so obvious other jealous dudes are harassing you guys about it.

But think of it. If that's happening now, when people know you are dating there's a real possibility of drama. And if you two break up, it may mean one of you leaving to another company. Think of all this, and try to take his perspective with this in mind.

If you two do decide to make something happen, stop with the reading together, eating together, walking together, etc. This isn't high school. You have office politics to worry about. And tell him to stop being such a doofus with the obvious, loud teasing. He's going to get both of you in trouble. When you two have cemented your relationship and no amount of drama will sabotage it or cost you your jobs, then come out. I personally don't always believe that dating coworkers is bad, but I believe its wrought with danger simply because the workplace is a dangerous place. So if you're going to do it, be mature and smart about it. And this guy doesn't seem to be doing either, by your post. Remember, there are backbiters, pot-stirrers, sociopaths, politicians, and snakes at every corner and a workplace dating relationship is a goldmine for saboteurs who have been patiently waiting.