Business partner problems?

i'm in a small restaurant business with my friend. we're co-owners of the restaurant with equal shares. his gf seems to like to think she has a part in this and is always at the restaurant meeting, during business hours, etc. she is constantly using the office and the computer that we keep important documents in, and i've told my partner several times that she shouldn't be here unless he is present at the shop. what shoudl i do?

also, my business partner and i used to be pretty good friends, but now i do not want to have anything personal to do with him anymore. i would like to sever all ties and keep it all proffessional. it seems to me that he likes to use personal things against me. a quick example. we had a delivery driver with a suspended license. the driver owes my partner money, and i wanted to fire him. my partner got mad and said i was selfish because i didnt' put him into consideration.

basically, i need advice on how to keep it all business from now on.

To quote the old adage, "It's business, not personal." Sometimes though, that idea is a bit more difficult to actually operate by.

I would recommend that the two of you sit down, outside of the restaurant - at a neutral location, for instance a Starbucks or something, and work out your differences. Try coming up with a plan that would make both of you happy, including a time schedule when one of you will be in the office, and the other not, if that might be something to help the partnership succeed.

Just my 2 cents though,
J