LinkedIn

I don’t know much about this social media site other than it’s used for connecting for jobs? However, I saw today that my boyfriend has been viewing young brunettes that are not in his company, field of work or even state (he’s an engineer and he’s looking at bartenders, sorority girls, etc...). I wouldn’t be concerned normally but these are the ONLY profile he views. What should I do? I’ve already confronted him and asked who they are and he just asked why I was looking at his LinkedIn instead of answering my question.