Daily crush update

He texts me at 1 am in the night saying he was drunk and out with friends. At 4 am he texts me saying he just returned home.
I don't understand how he can seem so cheerful about it.
Today he was joking about how he wanted a whiskey treat from a colleague.
I like to see his face all lit up and happy, but there is a deep gnawing sadness inside me which grows every time he talks of weed, alcohol or smoking.