<human>: Background: My girlfriend "Sarah" and I have been together for 2 years, and we've never had any real issues with our relationship. This isn't a major issue, either. But I find it weird and I wanted to get some input from other people.

This has been going on for about a month now. Every time I use the bathroom, whether it's at my house or hers, Sarah goes in there shortly afterwards. She spends a while in there, longer than it would normally take to pee, and I don't hear her flushing the toilet. Sometimes I hear her running the sink, sometimes not. The only time she does this is right after I've used the toilet, and she never did it prior to the last month or so.

Today I asked her what she was doing in there and she just looked at me weirdly and told me she had to pee... Again, I didn't hear the toilet flush, but I didn't press the issue because it's awkward. I'm just curious if anyone has any insight into what's going on? She is kind of creeping me out.

Give me the gist of the text in a nutshell
<bot>: GF always enters the bathroom right after I use it. Evades questions about it. Is there a logical explanation for this?