Love / Will he have an affair with me? [17]

I am 30 and I have relocated in Cracow for business

I have a colleague at work (married- pretty sure - 40+) that I see although not too often as we work in different branches in the city.

We went dinner, mostly talked about business but we had a great time and he walked me home.

I really like this guy- I am not looking for anything serious, just to have a good time and go out sometime.

I have no more excuses to make another move as I do not see him every day, what can I do?? As I am used to a direct approach, I am not recognizing clear signals if he is interested or not.

Shall I wait or make another move? I do not want to scare him. Thanks !