What exactly is wrong with me?

I've this amazing and good friend who I really miss talking to. I've been thinking about him and waited for him to login msn for days but he didn't. So I decided to text him and he replied in 5 mins. So now we've been texting each other since yesterday. But I don't understand why when he first replied me in 5 minutes, I feel so contented and thoughts about missing him disappeared immediately. It's like the misses and anxiousness went away. Why?