I JUST CAN'T WAIT

He tried waiting few days before he'd finally call her. But after the second day, he just couldn't wait any longer. He picked up his phone and called. "who's this?"..."the guy you gave your number two days ago".."oh, what's up?". They talked on and on. The call lasted for several minute. After the 30th minute. They finally said their goodbyes. After dropping the call, she felt like it was the best conversation she had ever had, she took some minutes on her bed, reminiscing on their conversation. After all she has also being noticing him too.. She's feeling something in her heart. What could it be?