Ashamed to call him my boyfriend

So a few days ago I logged into my bfs messenger (no, not to stalk who he talks to I just usually go on it to look at all the memes he sends in his group chat w/ his friends) and I found this:

These are screenshots from his phone and him sending them to the group chat “priding” himself as to how funny he is. And let me tell you no one in the gc laughed.

I then later questioned him about why he’d do that and if this girl has ever done something bad to him but she hasn’t. He just enjoyed making her feel shit and feel uncomfortable, here are some screens of what excuses he used to “explain” himself:

I seriously feel ashamed that people (his friends and this girl) look at me and think that since I’m dating him I must be similar to him because I’m not, to me he crossed every possible line there is with his behavior and I’m seriously thinking if I want to be with a person that acts as immature as an 8 year old even though he’s 19