Can telling someone "you love them" be bad for a relationship ?

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I remember a local ska song whose lyrics go something like this : [b]Never let a woman know how much you care cause there will be no peace in your life a woman is like an arrow and a man is like a shadow run down you shadow now you will never catch it [/b] I was never good at interpreting song lyrics but I think the song was saying that expressing how you feel about a women might lead to a futile situation similar to running down your shadow. This is because the woman may get complacent in knowing that you love her and seek to push that limit to see how much you do for her (if my interprettation is wrong please correct me). So have you ever had a situation in which you expressed love for someone and found that it brought out an egotistic and vain side of them ? Or do you contend that that wasn’t love in the first place ? If you have ever had any experience along those lines please tell me Disclaimer : The song might have specifically mentioned females and I might have continued my discussions along those lines but I am sure this extends to males as well so please don’t brand me as sexist. Looking forward to passionate responses.