Spouse cheated while at their cousins birthday party and then had a brief 3 week affair?

What should I do show them the proof first then ask or ask them and then show proof or try to work it out?

Proof first then ask
Ask then proof
Try to work it out
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Updates
+1 y
I have screenshots of they chats (that have shared back and forth explicit photos along with photos a friend took of them kissing time and date stamped, even a recording of the person that they cheated with verifying it.
Updates
+1 y
Presented evidence still denied it. Told him im going to lawyer next week to file for divorce his response "I don't want the girls you have them. I'll sign my rights away."
Spouse cheated while at their cousins birthday party and then had a brief 3 week affair?
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