I feel like he doesnt understand..?

So,ive been going out with a guy for a few months.i really like him and all but lately i feel like he's bored with me.During our conversations its like he zones out.He usually replies with a short answer like,cool.no.yes.dunno.i was over at his place and wanted to do our normal routine.He tells me nah,im fine, and nope alot.Its like im not even there.I was expecting him to hold the door open for me the other day and he just waited for me to open it.I mean,i want him to treat me like a princess...(cos im tht type of girl.)I want him to look out for me more and pay more attention cos he always zones out and focuses on other things.I was thinking of ignoring him for a while by not texting,calling or hanging out with him.But idk..i just wanna feel important and loved.what should i do...?plz help