<human>: Can you succinctly summarize the text in 1-3 sentences?

My current girlfriend's ex used to live where we are living now and we got his mail. She didn't say anything about it until I found the strange piece of mail on the counter a week or so later and she said she had texted him. I didn't really have a problem with any of that and I thought nothing of it.

Later on however, for probably the past week she has been very touchy about me using her phone for anything, which is a new thing, never was much of a problem. I got suspicious and looked through it while she was sleeping. 

It was obvious that he had continued feelings for her by the messages he was sending and despite it being very obvious she was trying to get him to actually say it. Eventually he said something along the lines of "If you are ever single again I would, but I have to be respectful and keep it to myself." To which she responded, "haha, I love you [Name]." 

I feel bad for going through her phone and maybe they just had a close relationship because I know she was close to his parents at least. She doesn't seem to be acting differently towards me, I just can't figure it out and don't know how to bring it up. 

Thanks for reading, any advice helps
<bot>: Girlfriend told ex she loved him over text, hard to tell if its friendship or something deeper, afraid to bring it up, and don't know how