Set up a date on Monday with a girl.

Tonight I got high and she has expressed an interest in weed (ik she smokes) so sent her (amongst others) a snap of it against my better judgement (normally I keep shut once I secure a date). Turned into a mini conversation and I asked where she was "at my girlfriends house"

So I thought k fuck it and said see you on Monday ;)

She responds "we can't come out on Monday" so she flaked on me. I respond with "..." and she asks what I mean.

Next & don't repeat the same mistake?