It doesn't seem fair, but these laws aren't really based on individual fairness, but on the impact they would have on society. Making abortion easy for women has nothing but societal benefits. Making it easy for men to disown children they don't fancy paying for would cause massive problems.
Think about what you're asking. Yes, for the majority of people in a loving or at least respectful relationship, you'd expect them to involve their partner in their decisions. But what about the other cases? Is it necessary to inform a one-night stand that you're going to have an abortion? Take it further. Is it necessary to inform your rapist that you're going to abort their baby? What about a woman in an abusive or controlling relationship? Or a woman from a religious background that forbids abortion who knows that the man will tell other people about it? Yes, in an ideal world, what you're saying makes sense, but you have to look at the circumstances surrounding abortions. Women who don't tell the father about it usually have a pretty good reason for not doing so.