Both of you seem immature to me. Especially her... Saying "I love you" on the second day is just redundant. It just means that she has no idea about love. And that she's in love with the concept of love, not with you. And that's why her feelings always disappear.
Now for the kissing thing I don't know what's the big deal about it. Come on! How old are you that you're making a kiss with YOUR GIRLFRIEND a big deal? I mean... usually I kiss, and most of the time fuck the girls BEFORE they're offocially my girlfriends, so what's all the fuss for?
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Would establishing the emotional connection lead to something deeper than the physical stuff and possibly make the relationship last longer?
Yes... establishing an emotional connection leads to deeper things. However, a passionate kiss is a great way of establishing that connection. There's nothing wrong with it, you just have to make sure that both of you are having fun times. Make things memorable! Create some romance. Be a man, and don't wuss around such things as a kiss.