<human>: Summarize the given text in a few sentences.

Hello, my s/o [m23] has posted a photo that I am not comfortable with. He acts like it is no big deal. He works at a Vape shop and this girl seems to be in there every night they seem pretty comfortable with each other he buys her soda he lets her use his Vape whenever she wants he posts her a lot on snap chat. I have threatened to leave him am I over reacting should I be more upset!? Help!! 
The photo is of the girl licking his Vape while he is holding in in his hand 

I should also add that I always assume that he likes every girl he talks to but he has never posted a picture like this before of a girl

Also he don't post her all the time on snapchat but he posts other girls a lot more then he posts me
<bot>: My bf [m23] has posted a photo I feel is inappropriate and I have threatened to break up with him am I over reacting?