Hey guys;

I've been seeing 4 girls for a while now. One, who I'm definitely closest to, for about 2 years. She is aware that we're not exclusive, and although she doesn't like it, she doesn't want to be dropped from my life completely.

Today we were having a marathon sex session, and she was totally into it. After we wound down and cuddled for a bit, I went and took a shower. When I came back in the room, she was looking through Instagram. We cuddled a bit more, then she got up, seeming very distant and said her goodbyes.

After I walked her out, I came back to my room and noticed that my phone was sitting on the bed. I realized that she had been going through MY phone, after taking it out of my pants on the floor. She must have noticed me type the password or something.

Either way, I feel ill that I was so stupid to let her see my password. I have been thinking, and I don't think I'm ok with stringing her along with sex and excitement, while I'm clearly hurting her emotionally. I'm not a bad person, and I do care about doing right by other people.

What do you guys think? Anyone else out there encounter these feelings? I feel really disappointed in myself and could use some advice. I don't want to go to /r/relationships as their advice is usually, well, you know what it is...