<human>: So backstory. We have been together for almost 6 years. Got together in High School and have been with each other since. We were each others first. We've had some rough patches, but been mostly good.

Except for the past few months. She recently started cosmology school and ever since things have changed. She is very distance, staying at friends houses alot more, and we hardly have sex anymore. 

I have noticed that she is very protective of her phone now. Any time I walk into the room, she shuts her screen off right away. Or will turn the screen away from me so I cant see. 

I feel like she is cheating on me. This isnt the first time she's been this way with her phone. About a year ago I found out she was getting rather friendly with a guy friend on the phone. Pictures exchanged, etc. I talked to her about it and she apologized and said it would never happen again. I loved her(still love her) and gave her a 2nd chance. Up until last few months, things were great.

We also moved in together recently, which is the main reason for my nervousness.

I am done with it now. I am going to bring it out in the open and talk about it. Unless she can prove to me she isnt cheating, then I am going to end it.

Give me a shortened version of the text
<bot>: Think GF is cheating on me. Not the first time I have thought this. Going to bring it up and most likely will end the relationship. Nervous about the conversation.