If you dream that your partner was okay with you cheating, you may feel be feeling guilty about something. Alternately, this dream can suggest that you are exploring areas of your sexuality, but still wish to remain with your real-life partner.
To dream that you are cheating with your boyfriend’s friend means you are feeling neglected by your boyfriend.
To dream that your sweetie is cheating on you, means you are scared of being abandoned. You may feel some lack of attention in the relationship.