<human>: Can you succinctly summarize the text in 1-3 sentences?

My wife just had her first extramarital date.  It was worth an old friend of hers, and they slept together.

We came to this agreement mutually, several months ago, where we could sleep with other people, as long as certain rules were followed:

* Protection would always be used.

* No always means no.

* The other spouse has to know about the event.

* Any emotion that comes up will be discussed openly between us.

All of this being said, I am not sure how I feel right now.  Last night, I felt very isolated & alone.  I'm kind of sad, but at the same time, I'm glad that my wife got attention that she felt she wasn't getting from me (even though we had sex 2 nights ago).
<bot>: Wife & I are in an open marriage, but after she slept with someone on their first date, I'm conflicted.