How would you feel given the following circumstances?

My girlfriend and I often have a lot of problems seeing eye-to-eye on things. I don’t believe it’s because we don’t have the same values, but really I have no explanation or justification for this. We often have arguments over what a ‘normal’ person would do, and in light of a recent argument, I have the following question to ask:

Throughout the week, your partner has been busy with schoolwork and work in particular. You usually see each other on Saturdays. However, when discussing times in which you will see each other, s/he says they can only see you for 2 hours in the morning because they are busy with homework. When Saturday arrives, you see one another for the 2 hours, but then later s/he doesn’t end up doing any of the homework s/he intended to do, and instead goes out with friends for a couple hours in the evening. (Note that s/he went out with friends the previous night for several hours as well.)

Was it in poor taste for your partner to turn you down on the pretext of having homework, only to not do the homework and instead go out with friends for the evening despite already having been with friends the previous night?

Would you feel slightly offended if your partner did this to you?

Please note, no detail which is relevant to the questions asked has been omitted, and nor are there any special circumstances or context to this situation.