A friendship with a friendstitute
I forgot to bring enough cash to pay for my friendstitute's meal so our friendstituteship came to an end :((
Someone with all the qualities of a normal friend except they never take care of their portion of a bill, stiff you on previously agreed upon payment sharing arrangements and take any other opportunity to extract money from you despite being financially very comfortable.
I really enjoy the time I spend with my friendstitute Justine. We laugh, have intellectual debates and reminicse about old times. I just better remember to bring enough cash to pay for everything or our friendstituteship may come to an end.