my ex gf contacted me during no contact . any advice?

gday mates. im not going to go into my back ground with my ex u can read my previous posts. anyway i started no contact 2 weeks ago after it seemed i was getting no where with my ex by keeping in contact with her. doing NC was really hard but i tried my best to keep busy and have been concentrating on my self by hitting the gym and catching up with friends. anyway my ex hadnt been too interested in what i had been doing before i started NC. so i decided to lay low ,stay off FB etc. anyway yestrrday out of the blue she called me and obviously i couldnt help myself but to answer because i miss her deeply. we had a good chat for 20 minutes and i kept my cool and didnt bring anything up about the break up because it was pretty bad . just kept the conversation casual . i basically said ive been rreally good keeping busy and doing weights. bla bla bla. anyway she give me a fairly lame excuse why she rang. something to do with a wedding we were both invited too and she wasnt sure if she should go or not because it would be awkward for us both. i said dont mind if u come its upto you. she decided against it. what do u think she didnt have to tell me shes not going but tell the wedding couple. ? seems like a weak excuse to call me. is she checking up on me or what? not sure what to do from here? i know in my heart that our relationship was very special and we were deeply in love. it was my stupidity which killed that. i can feel it in my bones that we are meant to be together. some advice from here on would be great. thank u