I noticed this little guy guarding the lavender plant in my garden for the last week or two. I am assuming he's a male because I witnessed what I think was a mating between him and a female. He hovers and buzzes around the lavender, sometimes around the perimeter, sometimes among the stems, and sometimes darts away from the plant then returns. He chases away, bonks, and even mounts other bees or wasps that come near. He sometimes hovers close to me. He behaves very much like a carpenter bee would but he doesn't look like any of the carpenter bees I see online. Is he a carpenter bee? If not, what is he?