<human>: I've been in a relationship with my boyfriend for 3 months. Everything has been good lately and things seem pretty serious. We've both met each other's families, and he tells me regularly that he loves me. 

However, the other day I saw one of his friends instagramed a screenshot of a text conversation between her and my boyfriend (we don't follow each other so she had no idea that I would see it, and from the conversation I'm not sure if she even knows he has a girlfriend). 

The conversation basically went as follows: 

Him: Sorry I can't hang out tomorrow, I have a date ;) 

Her: Oh ya, get it in! 

Him: That's the plan anyway. 

later that night:

Him: andddd I got it in

Her: yessss

At first, I thought he might have been referring to a date with someone else and could possibly have been cheating on me.. however, the date from the text lined up with a time that we did hang out. I asked him about it, and he played it off saying that he was just joking around.

I'm hurt by the conversation, because I don't like being referred to so casually and this makes me question how serious he is about our relationship. Am I overreacting or do I have a right to be upset?

Condense the text into a few key points
<bot>: Saw screenshot of texts between bf and his friend, in which he refers to me very casually. Am I overreacting by being upset?