Long distance advice

I've been talking to the guy for nearly 2 years now ( on and off ). I'm going to see him the beginning months of next year, the issue is he's starting to see a girl there. He says that he wants to be with me and if it progresses he'd leave her for me but i don't want him to do that. Also is it better to not speak every day. I really like him and don't know how to approach the situation should I try and take him as a friend or just leave, or wait it out?! Please help !
He is also a little bit older then me