I'm sorry you are having some bumps in the road with your friendship.

I have found that keeping busy by filling your life with the stuff that makes you happy really helps to keep life fulfilling which in turn makes you less dependent on one other person. It seems that your friend was your main source of fun and that is always a bit risky. Sometimes I go to the movies alone and have a nice time, or I have sent out a casual open invitation when I want to go out for dinner and my husband is working that night--its a nice way to establish new contacts for possible friends.
Here are some ideas: host a bbq at your place/invite people over for some sports event on tv if you have pay per view (or put out the word you're popping over to a well liked local sports bar to watch and you don't mind some company)/join a club of some kind (I joined the photography club, toastmasters and running clubs at different points in my life).