Imagine that, she is actually correct! Met up with her earlier this year over lunch and chatted about her marriage and my lack of one. She reassured me that I'm going to find someone who's like me, someone who works too much and has no time to do anything else (and all the time in the world to wander around aimlessly). I apologise now, because I pooh-poohed her insistence that there's gotta be someone out there too and that it's just a matter of time.
Well, imagine that, she's actually right.
There are only two phrases for this situation: "already attached" and "emotionally unavailable".