had a loving relationship with a girl for 3 years. We broke up for a month because we were both going through a lot of stress and she was getting grass is greener syndrome.

After 1 month we reconcile and she apologizes and admits she made an error. I choose to forgive her but she told me she slept with my coworker a few times.

How do I best cope with this? Note that it isn't something I think about 24/7 and I'm still able to smile and enjoy her company as before. It is just something that may pop into my head occasionally.  what can I do about it? what can she do about it?
user
Had a great relationship for 3 years, broke up
assistant
had a loving relationship with a girl for 3 years. We broke up for a month because we were both going through a lot of stress and she was getting grass is greener syndrome.

After 1 month we reconcile and she apologizes and admits she made an error. I choose to forgive her but she told me she slept with my coworker a few times.

How do I best cope with this? Note that it isn't something I think about 24/7 and I'm still able to smile and enjoy her company as before. It is just something that may pop into my head occasionally.  what can I do about it? what can she do about it?
user
gf slept with my coworker and it is a
assistant