Only snaps me when we are about to lose our streak?

As I mentioned, he only Snapchats me when it seems that we have the timer. This is a guy that I’ve already hooked up with and he used to Snapchat me back really fast, i was #1 of his best friends list vice versa. Every time he sees me in person he’s super nice ( but we also haven’t seen each other because we are on our winter break for college so that also might be part of it) and starts a conversation. But on Snapchat he’s been way slower, even though his snapscore goes up and he’s active. Usually this wouldn’t bother me, people move on, but I’m just confused on why he’s making such an effort to not lose our streak like what does the streak mean to him?

Only snaps me when we are about to lose our streak?
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