What does it mean when a guy says he needs a bit of time?

Ok so I known this guy for only a couple of days so far but over a really short time we started to like eachother. We flirted for while and then started getting really sweet and etc. Well he's a lot older then me unfortuntelly and he seemed really upset that I was younger... and we talked for a bit about it and he told me he wasn't quite sure how he felt for me anymore, and that he need time. And so I need to know if that's a really bad sign or not?
Updates:
+1 y
He also said even though he needs a bit of time , he would like to still keep in contact with me...
What does it mean when a guy says he needs a bit of time?
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