Our 3yo has been experimenting with the "i don't love you", "I don't want you" statements. I find that he usually means that he's not into any contact with that parent at that moment. So I ask him "would you like to continue [fill in whatever it was that he was doing when he said it]? Usually followed by a yes. Or he wants to be alone. Sometimes he'll say it when he really prefers the other parent to be with him for whatever it is is going on at that point.
For us it feels like it's a statement of individuality, he's realized that he's a person on his own, with his own needs and feelings, and that he's got a control over what happens. So I try to reword it for him in more appropriate terms, since I feel often that his "I don't love you" comments are more of an inadequate way of expressing himself than anything else. He's trying to say *something* and those are the words that he's got so far.
Since we started doing this, he's been learning how to indicate that he needs to have some time on his own (mama, I don't want you"... meaning "mama, I would really like to play with the train on my own, butt out", he's now saying "mama, I want papa to bring me to bed tonight" ("mama, I don't love you" in response to my "I love you"... meaning that he's not feeling the contact with me that I'm wanting to feel with him). Also, sometimes I just translate the "I don't love you" phrases into "Are you feeling upset about something?", to which he usually just says Yes, and then he tries to fill in whatever it is that he is disappointed about.
Translating the upsetting phrases into different words has really helped him. He now thinks twice, and has even come to understand and use the phrase: "mama, i'm trying to say something but I don't have all the words." And then we can sit down together and figure out which words he is looking for.
Doesn't take away from the pain that it causes to hear the words. All the love and care we put into raising our kids, all the insecurities it touches on to hear those words spoken by our little ones.... but perhaps it helps to know that they do not have the full scope of the meaning that those words have for us. Their vocab is just starting out... where they use the word "hate", they might mean that they are sad about something that you did, or angry, or confused... hate is much more neutral for them than it is for us. Trying to find out what the real message is behind the hurtful phrase is very helpful.
And I totally second the sexuality points that RachelGS makes at the beginning of this thread.
