Hi,
Firstly, please do not simply go by Horary interps, and try and gather more pointers as to whether your friend could have taken the money.
You = Sat
Friend = Jup
Missing Money = chart's 2nd house = Mars
What we need here is a connection of some sort between your 2nd H (your money) ruler, Mars, and your friend. The Moon is the driver of the chart. Look at the Moon, it is in your 2nd house. Its last aspect was with Mars, your money that has gone missing, and right before that with Jup (your friend). Moon shows the link, and the change of hands of the money. Now notice where Mars is located: in your 11th house = house of your friend. Jup's current condition is not good as we all know. This can reflect two things: either he really needed the money (which still does not justify the action), or, being in the sign whose ruler is known to signify thieves, he couldn't resist the temptation.
Don't know what advice would be correct on a human level, as it is a delicate situation. I, in your shoes, would not simply end matters, but have an open talk with him, as in saying that the money is missing, in general. You cannot yet be sure that he took the money. The reaction should give you some pointers, and, if the friendship is important enough, both will sort of try to somehow 'mend the situation'.
AQ7