Odi et amo. quare id faciam, fortasse requiris?
nescio, sed fieri sentio et excrucior.

I hate and I love. Is that possible? Aren’t both of them opposites?

Spinoza defined love as “a pleasure accompanied by the idea of an external cause” and hate as “pain accompanied by the idea of an external cause”.

So using his definition, we know that pain and pleasure repel, but does this mean that hate and love are opposites? I say, no. Simply because love is not always pleasant nor hate, painful.
We all are acquainted with the pain of unrequited love and even then, requited love can bring pain in its train. How so? Because with the attachment of love comes the anxiety and pain of loss, whether actual or merely feared. Love means that we are vulnerable in ways that enhance the possibilities of loss, hence the likelihood of it being painful.
Hate, on the other hand, isn’t always painful. We are aware, if we haven’t experienced it, that hate can be revelled in as we enjoy the passion and intrigue that we direct at our enemies, as disturbing as it seems, we take sadistic pleasure in hating someone or something.
Thus based on Spinoza’s definition, they aren’t opposites seeing as what defines them isn’t even concrete but seems to change with the context and situation.

Can we argue that they are equivalent? I mean, if we were to think about it, love and hate are both passionate involvement in something or towards someone. So perhaps, the opposition is not between love and hate but between the passionate involvement and indifference. After all, I’m sure you’ve heard people say that the opposite of love is not hate, but indifference. Indifference is merely a distancing emotional neutrality. Thus detached, we neither love nor hate.

So the question still begs to be answered, can we love and hate at the same time? Certainly we can if we are hating and loving different things, just at the same time. And if we loved and hated the same object? Even then it’s quite an easy argument to accept, simply because we can love one aspect of something and dislike another (e.g. I may love X’s sensitivity, yet hate his need for affirmation). Now if we look at it even further, can we love and hate the same aspect of the same object at the same time? I say yes. I can love someone for being gentlemanly, but at the same time hate the fact that he always has to be so nice and gentlemanly, if you get what I mean. I don’t know how to explain this concept because I haven’t read up on it enough.

And so,
Odi et amo. quare id faciam, fortasse requiris?
nescio, sed fieri sentio et excrucior.

You have no idea. 
‘The pleasure of your company made me joyous; it made me want to care for you as well. And there love sprung, for I enjoyed the times we spent together, and I relish the prospect of spending even more time with you. So I shall listen; I shall say “Je t’aime”, “Ich liebe dich” and “I love you”; let me listen, and let me admire the rhythms of your speech. Let me play the role of lover; let us be together as God intended Man and Woman to be; for indeed, it is nothing to be ashamed of, but to be happy about.’
I don’t know if you meant it, I don’t suppose you do. Then again, you’re terrified. And yet I don’t know if I should wait, for what’s the point of waiting if there is no hope? 4 years is a mighty long time.