Why is my friend acting like this? Is she upset or does she not care at all?

I'm gay to, and I know other girls can be hard to read (seeing as I'm like one of those girls lolz). But hm... Maybe you should leave her in the past (I'm not trying to say it in a bad way) but when someone doesn't appreciate what you have to offer than you have to stop trying to give it to them. I'm sure your not like 30 lolz, but sometimes its better to just move from the past to better YOURSELF for the future. It's 'selfish' but from what your saying about her she is being more 'selfish' you only live once don't let anyone else control that :D