Question about my boyfriend...?

so i am 19 and my boyfriend is 20, we've been together about a month now, and the other day, we were hanging out after school at a coffeehouse on campus. cles end early on fridays, so it was pretty quiet. we talked a while, soon everyone was gone. he kisses me on the cheek sometimes. anyway, that day, he kissed me on the lips for the first time...(first kiss for me ever) it was just a peck. a few mintues later we kissed again. mind no one was around...i'm not big on pda. but he then asked me if i ever get worked up, i was honest, but truth is, i ignore it. strong will haha. but he told me he was. and it was noticeable. he tried to hide it but it didnt work, he was a little embarred. i failed to mention i'm his first girlfriend. but i didn't know how to handle the situation, i kept acting the way i had been acting, i didn't act like i was weirded out... my question is how normal is this and if/when it happens again, how should i react?