Having a fwb

So me and this boy agreed to be fwb, we've been like that for almost 7 months. The thing is that we've had sex and i've catched feelings for him. He has feelings for me too but he doesnt want nothing serious. But when we started everything was good we were like dating each other eventhough i knew we were only fwb. Now he's acting different, sometimes it's like he doesn't want me anymore and other times it's like i'm his princess or sum. What should I do, end things? Or keep going with the flow?