ex boyfriend.

Me and my ex broke up after 1 year of dating but we ended on good terms. We help each other from time to time sometimes ONLY not very often. I miss him alot and I know he does too. If I miss him should I tell him that I do? I miss him but I don't want to get back together because I would rather just be single. He msgs me sometimes about giving back things to him that I asked to borrow for help and its normal but I still miss him. Should I let him know that I do even if I don't want to get back together? Or is it not okay? He also knows that I don't want to get back together.