I don't get my ex girlfriend?

Me and my ex broke up about a month ago. The first few weeks were a struggle for me then everything started to look up, I was happy and was starting to prefer the life of now... Anyway she text me one day, I was out with friends so when I had the chance I just said look I'm out with friends I'll text you when I can... She flipped and started going off on one say " oh since when did you go to dinner with your friends?! " and I just replied with oh I have a lot of free time now! Then the next day she said to me that she'd been having problems at home and was near giving up and was stressed and felt I was the only one she could talk to, but said I wasn't there for her even though she told me to get on with my life? I think that she's realised I'm gone and she always asks wether I'm out with girls, when I say yes she says oh well have fun!

I was confident I'd never get back with her because I was happier, but I promised her I'd be there for her whenever she needed me, so the last few days I've been there for her and she's just not paid any attention, just acted as though I wasn't there... I guess I just want to make her jealous and miss me and understand what she's missing? It sounds harsh but she doesn't realise, I'm 50/50 on wether I want her back so I guess I want make her come back to me?

Any advice is appreciated, thanks