["My girlfriend has been acting suspicious lately. Guarding her phone, being absent here and there when she didn't used to be. Having weird excuses for her weird behavior. She tells me nothing is going on, and I try to believe her. I don't know how much longer that will last."]
I'm sorry. It can be hard to be in a situation where you think the other person is cheating. Is there any other reason she might be acting suspicious? Have you talked to her about it?
My girlfriend has been acting suspicious lately. Guarding her phone, being absent here and there when she didn't used to be. Having weird excuses for her weird behavior. She tells me nothing is going on, and I try to believe her. I don't know how much longer that will last.