Why would a guy ask how long I've been single for?

Been talking to this guy online for about a day, he asks how long I've been single for. I said 6 years and he said 'wow that's a long time. May I ask the reason?' He's been single for a year and half.

I told him how I haven't had much luck with guys I felt connected with and how my busy schedule of working and studying, it didn't help either. And that timing and connection is really important to me.

He replied with a 'true that, each in its own way' and then just continued to ask about my ethnic background.

Why did he ask how long in the first place? What do you think went into his mind when I told him it's been 6 years and my reason? Do you think he thinks there's something wrong with me?
Why would a guy ask how long I've been single for?
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