My exhusband was like this ( it's not why we divorced). It was because he came from a very affectionate family and he was taught to treat women like godesses. It's a good thing. For me, I decided to buck-up and realize it was my own insecurity issue. Afterall, he was treating me like a queen too! Yes, sometimes I would get tired of his women coworkers going on and on at the Christmas party about what a WONDERFUL and CARING husband I had. Sure, they didn't know him behind closed doors. MANY times a female coworker would develop a crush on him because he would aways compliment them and shower them with kindness. The main thing that kept me from getting jealous is he always talked about me to other people. He'd tell them what a wonderful, beautiful wife he had , etc. I think this was important in balancing things for me.
If your bf has lead women to confusion on his attention before, and he did eventually have to set them straight, it is obvious his kindness is sincerely platonic. My advice is try not to get jealous. Try to become friends with all of his friends and coworkers so they know you are a strong part of his life.
I actually became bestfriends with one of my ex's coworkers that had a mad crush on him for a while. Before I knew her, she would call him all the time ( she was going through a divorce at the time). He would stay after work to talk, or help her move. I could of got jealous, but I decided to invite her over for dinner instead. We hit it off right away and we are still very good friends eventhough my marriage ended eventually.