A beer every day

Two old friends have a habit of drinking a beer in a bar every day for a long time. One day one of them announces bad news to his friend:

- Tomorrow I'm moving, promise me to come and have a beer for me every day in this bar.
- I promis you.

The next day, he comes back and orders 2 beers, as promised. The bartender asks him why 2 beers.

- My friend moved and I promised to drink a beer for him every day ...

Months pass and one evening he orders just 1 beer and the bartender asks him:

- He came back your boyfriend?
- No, but I stopped drinking.