<human>: So basically, my girlfriend went home a few days ago for the Easter break, as we live together at the moment in a house (6 people total) for university. We met early in the 1st year, in student halls and have been together ever since.

However, there are one or two things that have seemed odd now and again, but I normally just brush them off, until the other day.

The day she gets home, we text regularly right through to about 1 in the morning, when all of a sudden, I get a completely random text off her, talking about something completely different to our conversation, ending with "mhmmm exactly and how oddening it would be ;O >:) xx", I reply with, 'What are you talking about'? To which there is no reply.

I wake up the next morning to a text apologising, saying she "Wrote the text whilst she was half asleep", I find that hard to believe though, as she's never done it before, and the conversation was completely different to the one we were having, plus we never really send two x's, only one. Strange, but true.

That's not all, last summer, my SO and her Ex got talking again, which I was fine with, as long as she was open about it. I stumble on her FB one day when she was in the shower (already logged in) to find a message from her ex, and they were talking about meeting up, and alcohol was involved. To make it look like I wasn't snooping, I casually brought up her and her ex, with the chance of meeting up. She denied it and told me they were not going to meet up (red flag).

So here I am, with the suspicion that she's texting someone else super late at night and not telling me about it. I'm not sure to believe her story, or investigate more. She's normally pretty open about everything, but just the one or two things that happen when she goes home makes me think otherwise. What do you guys think?

Can you condense the text into three sentences or less?
<bot>: Receive random text from girlfriend, clearly not addressed to me, putting the pieces together makes me suspect she's talking to someone else.