'I've always loved you'. Could possibly mean: * I loved you in the past , I love you in the present and probably I will keep loving you in the future. * I've always loved you till this moment, but I feel like I am starting to hate you. * Why are you doing this to me, I got of my way and have loved you always,isn't that something ?!? 'I love you' has even more connotations not enough to mention them all here : * I have this feeling for you now and it is intense. * Le'ts make love * Change the subject * I am manipulating you with my words * When I look into your eyes, it feels like paradise. * I will pay the bill. xx

In this case, because "love" is not continuous, it is the same as: I have always been doing something. I am doing something. There is no special meaning. Standard present and present perfect.