<human>: My girlfriend of 9 months has always had this "best guy friend" ive been kinda suspicious about. I'm not a snooper or anything, but I have done a little detective work, and I'm kind of worried. It started a few months ago, she would text him and just act like its a friendly convo, which im perfectly fine with. But then i began making some observations.... Whenever she texts him, she usually deletes the conversation right after. When i ask her "Oh who ya textin?" She will be like my mom, or my friend lauren, or something, but i know its him. I saw one text which said "hhahhahaha i love you ***". But tonight it went a little to far for me to just ignore. This guys lives about a block down the street from her, and tonight on the phone my gf was half asleep, we were saying good night and then she said "are you okay to walk home by yourself?" i said "umm what?" and everything got quiet for a little, then she started acting super weird, and freaking out and crying and yelling at me. I told her nothings wrong and eventually she went off to bed.

Reddit, what do you think? What should I do? I've been struggling with clinical depression recently and this REALLY is not helping. Please help.

Can you condense the text into three sentences or less?
<bot>: suspicious of girlfriend for saying "are you okay to walk home by yourself" while she was half asleep on phone, when her "best guy friend" lives right down the street, who i have reason to be suspicious of.