<human>: Can you provide a brief overview of the text?

She went on holiday and met this guy named for purpose sakes 'J'. She didn't tell me about J at all and became friends on Facebook. She hid that they became friends. 

Anyway I was at a party with her friend and she showed me all the messages that the friend and my SO had been sending to each other. Most of the messages throughout the duration of the holiday regarded person J. My SO said firstly, to delete these messages so I would never read them. Secondly she said Ed was really hot and how she wishes she was single. Thirdly she rambled on about him for another hour. I now have no idea what to do. 

She promises nothing happened and I do believe her to an extent. But if that was the case, why the secrecy over the messages? Surely my SO and J must have had something going on if she was being so secretive about it. I'm as you can expect absolutely devastated. Im not a clingy person... we both have male/female friends and we both get plenty of our own space.

What should I do? Im really confused and hurt. \
<bot>: SO of 3 years has been suspicious with a guy but I don't think she acted on it. What do I do?