I agree with you. I don't like the way she treated Jacob at all. She really did string him along. Yea, she did tell him that it would never be more than friendship, but letting someone you know is crushing on you hold your hand and let them call you honey and things of that sort send out wrong messages.
I didn't want him with Bella. I think it was clear that Bella only wanted Edward (which is fine) but she should have been more clear about that with Jacob. I think Jacob was so persistent about dating her because of Bella's actions.
I don't know exactly what happens with their relationship after New Moon because I've only read up to New Moon but I'm excited to see how everything falls into place.