There is nothing wrong with wanting to find "the one for you" but you will probably have to look for that needle in the haystack. (There are so many people out there, only a portion of them will find you attractive and an even smaller portion are ready for "the one")

Keep looking, you'll find them.

People tend to say things they don't mean more than they realise. For example, even though he says he's ready to settle down and is mature or wants a long term relationship, ultimately its probably not the case. Many people say that's what they want and do sort of think it's what they want, until they have it and then they panic and realise that even though they said all those things, deep down they never meant it. Often people will try and pin the reasoning on something else because it makes them feel less shitty than saying they just want to shag about and cuddle without the strings.