Hmmm. My advice only made sense if you felt bad for sleeping with a friend's boyfriend but it sounds like you are mostly upset because he didn't fall for you. You sound like a pretty shitty person OP, probably a narcissist.

You hit on most of the criteria for Narcissism on the DSM list.

1. An exaggerated sense of self-importance (e.g., exaggerates achievements and talents, expects to be recognized as superior without commensurate achievements)

Yup, upset that this guy didn't fall for you.

1. Preoccupation with fantasies of unlimited success, power, brilliance, beauty, or ideal love.

Bet you think you're hot.

1. Believes he/she is "special" and can only be understood by, or should associate with, other special or high-status people (or institutions)

Dunno on this.

1. Requires excessive admiration.
2. Has a sense of entitlement.

Why didn't he fall for me!?

1. Selfishly takes advantage of others to achieve his own ends.

Yup, trying to steal "friend's" bf.

1. Lacks empathy.

Yup.

1. Is often envious of others or believes that others are envious of him/her.

Envious of your friend for sure, don't know about the second part.

1. Shows arrogant, haughty, patronizing, or contemptuous behaviors or attitudes.

Arrogance.

Anyways, hope your "friend" finds out and is able to cut two toxic people out of her life. Other people are telling you to confess, but that won't help you out personally so we all know you won't.