I have been seeing a guy for several months now. We are having great sex and he is very affectionate towards me. We spend the night together often and sleep in each other's arms. I really feel that I am in love with him and would like to take the relationship deeper. However, all the time we have been together he has been sleeping with other people as well. We went away for the weekend just recently and even though it was a great weekend I was a bit disappointed that he was determined to play up and did so a couple of times, though one of those times was in a threesome with me. He calls himself a "slut with nuts" and this is very true.
I am afraid to bring up the word 'love' in case that is not what he is looking for and I scare him off. I am not against him having sex with other people, especially if it includes a threesome with me. However, I would like to know that I am the priority in his life. At the moment I am feeling that he seems to think of our relationship just as a prolonged affair, with no strings attached. He just doesn't seem to communiate any intentions for anything deeper than what is happening now. This may or may not be the case. He may even be thinking I am the one that's not communicating. However, as I said I am afraid that if I bring it up I will scare him off, and I would rather have him as a prolonged affair than not at all. I am also scared that, seeing me as a prolonged affair, he will drop me as soon as someone else comes along and so I feel really insecure.
What should I do?