['I think all of my friends are just around for my money.', "I'm sure they're not - what makes you think that?", 'They never pay for anything and always look to me when the bill comes.']
Perhaps next time the bill arrives, say something like, ok, so that's $25 each and take out $25 and put it on the table. They may take the hint.
I am so sick of being used by my friends. I am done with them.