Friendly Boyfriend.. help?

So, I've been dating this guy for almost 15 months. We have been arguing about the same issue that he's too kind and friendly to other girls. He's that kind of guy that like to help others, and joking all the time with everyone, that's why he's so close with many girls.

The thing is, as his girlfriend, I feel hurt.

There are some reason why do I feel that he's being way too nice:
1. He chat with many girls, and sometimes he ignores me
2. He hang out with his friends, he always hang out in groups though, but sometimes he's the only guy there
3. He would drive girls home, for reason that he feels bad if he doesn't do it
4. He would wait for them to get picked up because he's that kind of guy that just can't leave a girl alone

But.. I also know that he's a really really great guy, he's so nice to me, he always try to make me happy.

But I can't help but to feel hurt everytime he did that with other girls. We've been arguing about this and never get a way out. Here's his argument, "I just think that it's nice to do that." When I told him that his nice behavior can't always be nice for me then he said, "So I can't be nice to other people?" He also said "Being nice is a part of me, its my value, and I can't change that. If I change that, than what makes me, 'me'?"

He said I'm overthinking, he wants me to be understanding, to be reasonable, and to understand that I'm the special one and everything that he do with other girls are just that him being nice and they're not special.

How can I solve this? I don't want to break up with him, but I don't know what to do.