Loving is natural among human beings. It has always been a factor in everything. I think in a relationship, a person should really love his/her partner, however, this should have limitations and reservations for him/herself. This is to be able to retain that self-respect and self-love if ever the couple breaks their relationship. If you give all your love to your partner and you left nothing for yourself, and if ever you break up, youll get shattered exuberantly and youll not manage to recover from the heartbreak. On the other side, if you reserve some little love for yourself, and if ever your heart get shattered from the hurt, youll be able to mend it yourself and welcome others to start a new relationship. That's my point.
There"s only one kind of love that can make us whole, and give us the happiness we all want: unconditional love. Loving unconditionally shows you have unlimited feelings for the person. Loving with reservations is not real love it is an imitation. If you cannot love without reservation, selflessly you cannot really love. Love is wanting to do anything you can for the person you love - that is real love. With love you have to take risks. There is always a possibility of a break up but if you do not have reservations it is less likely. For example, if you love someone selflessly you won't be tempted to cheat on them.
However there should be reservations for yourself. I do not agree with your opinion that you should love the person unconditionally to be able to convey true feelings. True love is not about loving other people. True love is about loving yourself. To be able to be individually complete, you should not give every love you have to other people. You should retain something for yourself. This is to be able to retain the dignity and principle you have for yourself. And if you love the person, you dont have to give everything for him/her. How would you assume to love sombody else if you don't love yourself in the first place? Remember that one of THE GREATEST LOVE OF ALL IS LOVING YOURSELF. Loving reservation is not being selfish. It's being practical and truthful. We can't say that the person we're in love with is really the destined one for us. And if ever the relationship went wrong (even loving unconditionally will not prevent undestined love from failing) at least you retain a little something for yourself and if ever the right person comes in your life, you could welcome him/her with open arms and start a new relationship hoping that everything would turn out great. That is according to true life experience. :)