I was reading about an actress who met her husband in acting school but nothing happened between them. 10 years later, they met again and started dating and eventually got married. Another well-known actor was in the same circle as his now-wife but never pursued her until they were both older. They then went on to date and get married.
I have always been suspicious of guys who don't express interest or chase a woman when they first meet but end up being interested in the woman, later on down the line. I don't trust their intentions because we've learnt that men chase after what they want immediately and anything less than that is them not being interested (e.g. a man says that he was shy or busy which is why he didn't chase a woman is an excuse, seeing as the truth is that he just wasn't interested in her).