Oh I am sorry it didn't work out, but it is a wise decision & if you want to do jumpers a trained one sometimes is an easier way to go anyway. I am sure the right horse is waiting out there for you!
Yeah Vidaloco is right, if you are getting a trained jumper if they don't jump it & let you jump it there is something wrong. There is a lot of things you have to be weary of when buying a horse people aren't always honest so you need to look for the catches etc yourself. The best way to look at the situation when you are looking at a horse is that the seller hasn't told you anything & you are accessing the horse with no previous knowledge just means you have your eyes open for any signs of problems or naughty behaviour!
Good luck looking for your new perfect boy!