Fill me in a little more. How old are you both? How long have you been together?
If you’re just dating your boyfriend, and it’s a new relationship, then this isn’t so much cheating as it is playing the field. But if you’ve got a long-standing commitment with your boyfriend, and you cheated to be in this threesome, and you liked it, you should consider how much the relationship with your boyfriend means to you. Chances are if he finds out without your telling him, he’s going to be very upset and probably break up with you If you tell him first, you can do some damage control — but only if you want to.
Knowing your age, the history of your relationship and what you’re looking for at this stage in your life will help me advise you. 🙂