I Need Advice On Relationships

I was talking with my boyfriend on the phone but he was playing a videogame so at a certain point his attention seemed to be struggling to get divided between me and the game.
As I was starting to say goodbye I mention that I was going to the seam for a dress. He asked what dressed, so I explained that I wanted to wear this dress on my birthday (two days from now) but it was too big so I had to do the seam.
He answer was something like "a dress? Ok... whatever you say...". It sounded a bit weird, like he wasn't very sure about it. But I know it could have just been him being distracted with the game. But anyway I asked if there was a problem with it because he said that in kinda of a weird way. And he seemed to lose patience and got irked and told me to stop finding problems where there aren't any, that he doesn't hide stuff etc.
And that hurt... I felt like he was treating me like I was a problematic person... but I'm not. There actually have been quite a few things that have been upsetting me but I haven't say anything. In our entire relationship (three months) I was only openly upset three times. The last time was actually a week ago and it was the first time I was actually pissed off and back down and it was because we were supposed to go out for lunch, he was picking me up and he kept falling asleep even though I kept calling him and waking him up. THREE HOURS later I was pissed and gave up and told not to bother to come. But it was the first time I got that upset, so him treating me now like I was some kind of over problematic person felt very unfair and hurtful.