Happy ending massage?

So me and my man went for a nice massage and it was amazing, they put us in a couples room so we could be together but seperate masseuse were used for each of us.. Anyway when we finished our relaxing massage we both got up and jumped up to get dressed...my boyfriend had an erection and i felt really hurt...did he get turned on with another female touching him?? Can someome tell me how they would feel if they were in my shoes please!!! :(