I think so too, just tell him you're checking out a dating site and plan to get to know some other people. You could tell him you're assuming he's ok with it since he has some other lovers and will be travelling a lot. And then ask, so are you ok with it? He'll say yes, you'll say great, and you two can get on with having a nice evening together. Or he'll say, I want you all to myself and am willing to drop my other lovers to make a life dedicated to you, doubtful right because he seems to like his current lifestyle and freedoms.