It sounds like you might be happier if you found a boyfriend you could have to yourself.
I'm sure other people here might say the same thing using a lot more words.
Only you know whether this sleeping arrangement is something you "need" in a relationship or something that you are going through as part of NRE and an adjustment period.
Make sure you are being honest with yourself. It is possible to fool others but no matter what kind of relationship you are in or who else you are in it with, you still have to live with yourself. That is the one thing that does not change from day to day.