How to deny a "friend" who is asking me to lend some money ( what he is asking is the largest anyone ever have asked me )?

What's the social etiquette here?

P.S:
I don't have good impression about him.

Few weeks ago, i changed my plans for him so that he could tag along with me to a place quite far away to apply for our course certificate . He delays the plan, not doing what he was supposed to do and had told me he would do.

I end up wasting 3 days waiting on him and finally goes on my own ( how it was supposed to be before I offered him free ride in the first place )

I don't like people who can't keep their words or let alone lie or don't tell you if they are not intending on keeping it.

Now I'm amazed by his nerve to ask money like that.