My son, who is almost 4, got his heart broken today. He isn't around a whole lot of other kids (he just started preschool this week), but was invited to a birthday party for his best friend who is our neighbor. Anyway, at the party, my son only wanted to play with his friend, because it was the only kid he knew. After about an hour, when other kids wanted to play with the birthday boy, my son got a little possessive and his friend yelled at him "you're not my friend!" and refused to play with him the rest of the party. I saw his little heart shatter. He even went to his friend and asked him to be nice. What do I do for him? He is hurt, and the rest of the party he was acting out, and trying to get his friend's attention. I feel horrible for him!
How horrible!! I don't really know if there is anything that you can do for him, other than maybe trying to explain why the other little boy reacted that way. At his age, though, it probably isn't going to matter to him. He's understandably upset.
Maybe you could get his mind off it by asking him about some of the kids in preschool and who he thinks he might like to be friends with there. And of course, hugs and kisses from mommy are always appropriate. 
my niece experienced the very same thing (right about at the same age) I think birthday parties with a whole bunch of kids is just heartbreak waiting to happen....... the birthday kid will know the relatives, neighbors, school kids etc and the others wont know each other....and most of the time there is not enough birthday kid to go around!
I try to keep my niece from going to these kinds of parties now (my son is still to young to care or know the difference). I never understand why people want so many kids over for their often very young child's b-day...... what a headache if you ask me (and a heartache for the little ones).
My oldest DD who is now 8 went through something similar except it was at school and not at a party. I would say within a couple of days they were best friends again. Kids go through all kinds of drama. Honestly some of what she tells me I just have to laugh at because she feels like it's the end of the world. I just try to console her and let her know that it will be ok. Honestly there's not a whole lot that you can do for him right now. He just needs to talk to his friend and work things out. Kids fight and make up all the time. Just give it a little time. They'll be good friends again in no time.
Thanks everyone.
I felt a little better about it this morning. I know it is something that kids just go through, but it really just rips my heart out! Don't you just wish you could protect them?
It's so hard to be a mom sometimes, isn't it? I have a 4 year old little girl, and another girl hurts her feelings all the time, and dd just loves her. I've noticed the other little girl try to get the other kids to go away from dd and once I heard her saying to another child how she didn't like dd, and I butted in, pretended not to know who she was talking about, and told her she needed to stop saying bad things aobut people. It sucks b/c we are best friends w/ her parents and see them a lot.
Just think how we're going to feel when they start dating. 
I have this same problem with a neighbor. Her DD is always telling my DD things like I don't like you and then wants her to play. When it is time to go she asks my DD for a hug and then when she comes towards her she runs away from her and teases her. These are just a few examples she does. I used to be very quiet about it because I didn't want to cause problems in the neighborhood but I have started speaking up for my DD. I think the other mom has started to see that her DD is doing this. I can only imagine what is going to happen when her DD starts school in 2 weeks. It does break my heart because like you said, you can just see how disappointed they are in their eyes.
It always hurts when your child is hurt-- I don't think that will ever change. However, I agree with sweetness_221 that it will probably blow over. Could you invite the birthday child over for a one on one play date-- or him and his mother to lunch out somewhere? Lots of hugs for him and I hope that it works out.
Yeah, I remember my dd and he bestf always getting mad and making up. But at the birthday I think the mom/parents should have had more control such as having organized games for them to play and little introduction games. Kids have a short attention span.
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