Hi Ollie,
Its sounds like you are in a very similar posistion to me. My ex broke up with me 4 months after a 1.5 year relationship. It was a small argument that triggered her emotions off, that resulted her needing space. After a few days I had to get in contact with her to try and figure out what the hell was going on and she broke up with me by text message saying that she needs to sort her career out, get her own friends back, live a little and not settle down. She said she realised this on her 21st birthday although she knew I didn't want to settle down and I was always happy to help her with anything. I then found out she had started seeing he ex again (I think - long story) but I don't think there together now if they ever were.
These reasons made me go no contact with her and I kept it like that for 2-3 months, it killed me not contacting her and I think of her everyday. But she never made an effort to contact me. I found out her gran had died 2 weeks ago and I decieded to contact her saying my thoughts are with her family. She replied saying thanks hun x. A couple of days later it was my birthday and happy birthday x, I replied saying thanks and then she started asking me about my plans for the year. I made out I was doing lots of stuff and asked her. She said shes got interviews and her grans funeral. I showed her sympathy and said well done but I haven't heard anything since. Although she has unblocked me on facebook and her status is single.
I don't know what the hell to do, I want to be with her and wish she'd come back like you wish your ex would come back. I can't stop thinking about her and I don't really think that I got any closure. I don't know if I showed her enough interest when she broke up with me as I didn't beg for her to come back or anything but I was so upset about her going to her ex (if she did). I've been so tempted to text her again but so far i've stopped myself, I haven't got a clue if she would be interested in sorting anything out.
I think your probably doing the right think by ignoring her, unless you just keep the replys short when you reply. I suppose you've got to go with whats in your heart and if you don't think theres any chance of getting back together then blocking her is a very strong move to make and it should help you get over her quicker.
I'm sure everything will turn out the best for both of us. If you've got any advice for me let me know.
Best of luck!