wedding invite friends??

so my friend didnt come to my wedding she cancelled on the day of my wedding. was a close friend. since then ive not seen her since but ive just recieved a weddig invite to attend her wedding. how can i decline i feel that she was meant to be my close friend and then didnt turn up to mine so we are no longer close not seen each other in nearly 2 years . I dont want it to seem that im being spirlteful but i dont think friendshios recover well from this she also did the same for my hen do and baby shower cancelling on the day