I would be careful. I have gone out to dinners and lunches with single men. They did not flirt or in any way think I was interested in them physically. They were kind and sympathetic to me. Basically listened and encouraged me. These are men I already knew in my marriage and could continue to know if my H returns.
You are very vulnerable right now. It is easy to get caught up in wanting company. This is how the OW became involved with my H, BTW. Do you really want to do this to yourself? Be careful with your heart. (and the rest of you )