Exes who want the chase more than they want the catch.
I’ve worked with men and women who are very much attracted to each other play this “I am not available” game back and forth, and in the end they end up not being able to see each other for weeks because one or the other is always “busy”.
You will find this an interesting read: 7 Reasons Advice On ‘How to Make Your Ex Miss You” Is Bad Advice