BF won't cum inside me!!

Mia
So my boyfriend and I have been having sex for a while now and I've been on the pill for ages! But he still refuses to cum inside of me, he always pulls out! (We never wear condoms) 
Last time we had sex, I was practically begging him to cum inside me because I want to see what it's like and I thought it would be enjoyable for him, but he just replied with "it's safer to pull out babe" I don't know whether he doesn't want to or whether he's just doing what's right for me? Help