Relationship to friends with benefits

Me and my boyfriend ian started dating on stept. 27th this year… Everything was going good until he started getting confused about his feelings and broke up with me jan 19th. He said he didn’t know if he liked me as much or something dumb like that. And he said I was getting too serious for our age(15). So I took it into consideration and fixed what I needed to and we were back together on jan 26th. Everything seemed to be okay until feb. 24th when he told me he was getting confused again.. His reasons this time were: “you complain a lot, even to other people, about us, your always negative and never happy and just a billion other things” and “we can’t have fun together anymore, we’re both never happy, your too clingy, and after being together and talking 24/7 you really get on my nerves.” Now, yesterday we went to nyc for a friends bday party and we hung out all day. On the 3 hour drive there we slept on each other.. He hugged me once all day and I asked for it. By the car ride home I just knew it was over and he texted me and told me it was. But then we slept on each other the whole ride home, again and he ended up moving my legs onto his lap and my 2 fingers were laced with his. Soo, it was like we were still together. I’m really confused that this point. He was texting a girl all day yesterday but I never found out who it was. We agreed to be friends with benefits. Is it a good idea? Do you think he likes someone else?