<human>: Provide a brief overview of the text.

My SO and I live together and spend a relatively good amount of time in each other's presence during the evenings.  We are both 26, work full time, and have our own hobbies and interests.  The length of the relationship is approximately 4 years.

The other evening, we made plans to do something and about 20 minutes in, he gets a text from a friend asking to get a drink.  He tells me that he is going to go hang out with his friend because he forgot that he had told him he'd get a drink with him earlier and since we see each other everyday anyway, I shouldn't have a problem with it.

I was kind of hurt by his nonchalance toward breaking our plans.  He did go out and I did my own thing for the remainder of the evening.  When I expressed that I felt hurt, he maintained that since we see each other so much and since he forgot he had already made plans with his friend, that I shouldn't be upset.

I can't tell if I'm being somewhat ridiculous or if he's being insensitive.  I'm so close to the situation that I can't see it objectively.  What do you think?
<bot>: Is it okay to break plans with a gf because you live with her and "see her everyday anyway" because you forgot about supposedly previous obligations?