This may come off as weird, but hear me out. The 3 words "I love you" are very powerful words. They are 3 little words that most women crave to hear. They are 3 words that make or break a relationship. In my opinion, they break the relationship as soon as they are uttered from one's lips.
In the early stages of a relationship "I love you" has yet to be said. At some point one or the other person is going to say it. For instance, if the girl says it first and the guy doesn't say it back, things in that relationship are never the same. Even if he says it back because he feels he has to, the guy looks at that relationship in a whole new light. He'll probably become distant and start back off.
Then there's the guy that says it first. He's the guy that says it first and then never says it again. You become the girl that now always says it first only to hear him say "I love you too." (Listen you idiot! I'm tired of saying it first...so maybe just maybe...you can say it sometime...and say it first!)
Then you have the guy that says "I love you," but says it all the time. And says it like it's the period on the end of his sentence. For instance, here's a conversation that I had once with my ex. Him: "What are we having for dinner?" Me: I don't know. What do you think about chicken marsala?" Him: "Yeah that sounds good. OK, Love you." (click) Gee, not feeling the love on that one. Nope, not at all.
When someone says "I love you" all the time and then never does anything or says anything else to show you that they love you, when they do say it at the end of a sentence it makes those 3 little words become rather meaningless.
I'm not saying that people shouldn't say "I love you." I wish I had someone saying that to me. What I am saying is, is that those 3 little words change the dynamic of the relationship. They change it for better or worse. And when it changes it for the better, you have to pay extra attention that you don't take it for granted.