<human>: Can you give me a shortened version of the text?

Me and my girlfriend of 5 months have been very happy over the course of our relationship. Lately I've been going through some struggles with work/family and it has affected my mood negatively. 

She recently went out one night with some co workers and one ex-employee. I noticed following this that she had been texting a guy pretty regularly so I asked her about it and she explained it was just an old co worker that she was friends with and hasn't seen in a long time. 

I told her I understand it's most likely just a friend and there's no foul play going on, but that I was uncomfortable with how often they were texting. She said she just doesn't have many friends and that's why she talks to him. I don't read the messages they send since it's not my business, but we were both upset after the conversation. 

In the days since I noticed she has changed his name in her phone and has changed her phone password (we play games on her phone from time to time and I couldn't get in). She also seems to be showing affection towards me less and less. 

I really don't think she's doing anything wrong, but my mind keeps connecting the way she's almost hiding this with her finding someone new and leaving me for him. Am I just overanalyzing this and she's upset that I'm invading her privacy?
<bot>: gf was texting an old friend, I confronted her about it, she got upset and changed his info in her phone. Now I don't know if I'm overanalyzing the situation or she's doing something wrong