Why would he say that? Should I press on it?

My situatuonship & i were teasing each other & it was getting a little sexual.. & he he abruptly texted like "goodnight Lizzy, sleep well bye" .. which is so dry,.. so i just replied back " oh ok thanks you too" he then he texts me a sweet message saying he wished all my dreams in life came true. Etc... but like it seemed like he was writing a farewell message so i asked him if everything was ok, & if he was saying bye fr( we never say bye to each other ) ... which he replied " Not exactly, but im not texting you regularly so I just wanted to let you know that, thats why I wrote that".
it was late so i didn't press on it... but i dont get why'd he say that...
( we just started talking this week again after barely talking for almost 2 weeks & yes we are complicated in the best way possible & i dont want to hear it about the term situationship... please. (: )

Why would he say that? Should I press on it?
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