Ex keeps messaging me "Goodnight" every night since we broke up, what does this mean?

A couple of days ago ( Saturday ) I broke up w my ex due to personal reasons. He said he disagreed with me on the reason I was breaking up w him but he accepted it, didn't fight it, and didn't even try to get our relationship back. We both walked away from each other and haven't talked in person since. We both work with each other which is awkward now but thankfully we don't have to interact at work. Every night since we broke up the only text I get is "Goodnight" and that's it. He doesn't text me through out the day or anything just a goodnight text which I never reply to. What does this mean? I haven't contact him since Saturday. If he still cares, cool but why not tell me how you feel if you want me or this back?

Ex keeps messaging me "Goodnight" every night since we broke up, what does this mean?
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