<human>: Can you provide a brief rundown of the text in within 3 sentences?

I broke up with my now current ex about 5 months ago.  There wasn't any physicality in the relationship, and at many times I felt like she didn't even want me around.  Like, not even a hug for about a week, and ignoring me when friends were around.  Turns out she cried for pretty much an entire day after I broke up with her, so I know there was some misreading going on on my part.  Either that or she overreacts a lot, which was my first thought.

Anyways, I was told by my brother that she has become more flirtatious after I broke up with her(not to him, but to others).  This saddened me a bit, because one reason I left her was because she didn't seem to want anything from me, emotionally or physically.  I do know that now that we're broken up, it isn't my business who she flirts with, so I don't pay it much mind.  Until it seems to happen around me.

Like when I was on a school trip a few days ago.  It's super late at night, she's sitting with a guy friend of mine, who I had actually ended up sleeping on earlier that trip(at like 6 in the morning, it was a long day).  Anyways, it looks like she's got her arms around him and is sleeping on him and hugging him.

This only caught my attention because I know that if I had been with her now and we were in this situation, she would have been totally against any kind of cuddling.  I know she wasn't doing it so that I could see, I had moved up to the front of the bus for something else, and it was random, and she doesn't know I saw it.  I just don't know what to think about her, or if I should even be thinking about this.  I just need someone else to talk me through it.
<bot>: Saw my ex-gf cuddling a guy and can't get it out of my head.  What's some advice?