What does it means ''I've been thinking lately, and... a bit, just a bit I miss you! ... ''

Anonymous
i was kind of dating this guy, was nothing defined, we never talked about it, but he had to leave, he lives in another State now and our goodbyes were ruined by my stupid behavior: he said he was leaving and I just smiled and told him to have a safe trip, as if I didn't care he was leaving for good - but I did, and I still do -, then he just hugged me and kissed me for I don't know how long in the forehead. After this we haven't talked for a couple of days and I texted him asking how he was doing and saying I didn't greet him as I'd wanted to, he replied saying he understood why I acted like that and then he wrote '' I've been thinking a lot lately, and.. a bit, just a bit, I miss you! '' what should I write him back? what does it means?his whole behavior when we were saying goodbye and his text.. it may be easy to understand, still I don't.
What does it means ''I've been thinking lately, and... a bit, just a bit I miss you! ... ''
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