Should I answer or ignore my ex.

Hi Brooke,
My ex-boyfriend who silently disappeared on me a year ago after he told me on our last date “I haven’t been thinking about a committed relationship yet.” He said he wasn’t ready. A 42 year old man, told me he wasn’t ready for relationship. Then, he disappear. A year an a few weeks later, he just texted me said “hello!” Should I ignore his text or should I answer him? I don’t know. It was hurt a year ago when he disappear without saying anything. It took me a long time to get my emotional feeling under control and stop thinking or missing him. All of the certain, he just text me. I’m not sure what to do now. I already move on with my life. I tell myself not to let him hurt me again. Please advise.
Thanks Brooke!