"it takes falling off 7 times to be a horseman..."
Well that's nice to hear. I'm almost a horseman twice over. 0.0
Falling is just one of those things that happens, I think. You can't let it control your riding, though, because then you'll get a stiff seat, stiff hands, stiff everything, and the horse will feel it. It's a lot easier said than done, I know. Whenever I get even a little freaked out, I stiffen up completely. I've fallen off a lot, sometimes his fault, sometimes mine.
Just relax. Don't even think about it. If you're confident, he will be, too.
If you fall, ALWAYS get back on. I got dragged against the wall on a horse I was riding for my trainer, and he made me get back on and jump him again. It's a confidence booster, I think.
Keep your head. If he starts to take off, buck, whatever, push your heels down, keep your legs where they should be, and stay calm, above all else. Again, easier said than done.
And lastly, don't anticipate it. Just ride. Falling off is a part of it, and (sorry to say it) but it's going to happen to everyone sooner or later.