<human>: I (32M) attended a going away gathering that was arranged for an ex a few weeks ago. I did not tell my SO. I did not plan to go, but rather ended up there with some friends. I was not there specifically to see the ex, and our interactions did not go beyond pleasantries.

A few nights ago, while out with my SO, we were introduced to someone who was at the gathering and she mentioned meeting me at "exs party the other day."

I panicked and for no good reason told my SO that it was months ago. She asked me twice if I was telling her the truth. The second time, a couple days after I lied, I admitted that I lied about the timing.

She seems to want to forgive me, but is not ok with any of it, nor should she be. I need advice on how to 1) regain her trust and 2) convince her that attending the party was not about me wanting to see the ex.

For context, SO is 24F. No significant age difference problems. We have been together for nearly 6 months. And I love her.

Give me a shortened version of the text
<bot>: Didn't tell my SO I attended party for a ex, then lied about the timing of it. Need advice on repairing the damage.