I won’t waffle. To cut a long story short:

I was with a guy for 9 years. We split. I went no contact. After about 4 years I found out he had a partner and a baby. He then ended up working in the same place as me. He got my details and sent me messages and still does. I haven’t responded yet. Should I? If I do what do I say or how? My instinct is to ignore.