<human>: Can you provide a brief overview of the text?

Let me start out by saying that I love my girlfriend very much. She's been with me through thick and thin for the past 3 years and we plan on getting married when I finish college (she already graduated) and we are financially stable. We started out as long distance for 2 years but finally got to be together due to moving for college. 

I usually always get a spark or lightheaded feeling when we kiss, like throwing yourself into the emotion. I can't really explain it too well, but I will assume you all know that kind of "in-love" feeling you get when you kiss someone special. However, we were making out tonight and I didn't get that feeling. We haven't really had any problems as of late and neither of us are mad at each other for any reason. It's all smooth sailing and normal currently. 

Why couldn't I get this love-y lightheaded feeling tonight? We were making out for almost an hour and I kept trying to feel it but it just wasn't there. 

We were previously watching YouTube videos with her resting in my arms and that gave me hella sparks, but why not this? Is this something I should be concerned about? Is it normal to not feel the sparks every time with kissing?
<bot>: I love my girlfriend but felt no sparks tonight when we kissed. Should I be worried or is it normal to have off nights?