What should i do about this problem?

I like this guy. He’s really nice to me. Problem is that i don’t know what his intentions are. How do i know if he really likes me or just wants what every guy wants..
Im really bad with relationships and i am scared to commit myself to someone. Thats why im really cold most of the time. Pda for example is out of the question even though i wish i could be all cute with him. I just dont wanna come off too easy but right now im just coming off like im a prude. What should i do? Can i change?—-