1. Just got out of a bad relationship and so they want to take some time before they start dating again.
2. They have standards and holding out until the right guy comes along.
3. Career,school,etc
Probably one or a combo of the 3.
I broke with my ex last year. Because he wasn't feeling me, he pretended to like me. But when I would try to get to know him, he would laugh it off or be silly. He wasn't interesting in getting to know me, but wanted kids, he said he wanted to get married, but he was ok with work a dead end retail job. He would text his friends all day but when we hung out he had nothing to say, didn't want to talk just wanted to watch movies or listen to music. So I won't claim anybody publicly as a boyfriend until I know its serious.