Most Helpful Guy
what youe feeling us understandable. you gave him the option to explore who he truly is but he is not open enough about it to share what is going on. this is the reason why i dont hing going out side a relationship is ever a good idea. even if its for a 3 some. usually there is always someone what gets left out and hurt. this time its you. he has all ready shown his willingness to cheat and if he show you his text messages you might find out he is doing it again but behind your back.
i personally feel you should drop him and move on to someone who will treat you as the special person you are
Most Helpful Girl
Since you don't trust him, then leave.