^ I think the takeaway should be that, yeah, you should be your whole world. It's the whole "love yourself first" thing. Doesn't mean you have to stop dating. Just prioritize being happy on your own first
That's the part I've never achieved, since I've never felt like I was worth something to myself - so how can I expect someone else to value me? Not sure where it comes from really, unless you count a life-time of mediocrity and settling for average; which makes changing it 10x harder when you just have this core belief of "Eh, I'm not really anything special."
Someone once said it can sometimes take another person to show us our worth, but I don't really buy into that idea either.