Him not being able to cum in a condom isnt anything to be worried about, its not like he has a problem or anything, my boyfriend hates wearing condoms because it de sensifys the feeling of being inside me which makes it harder for him to orgasm. Even though back in the day when he had to wear condoms yes he was able to cum, but it can change over time when you get used to having sex with someone, you just want the closest feeling you can have, you should definatly go on birth control it will take alot of worry away and then he can cum in you or he can pull out whatever. But nothing to worry about, only thing you need to worry about is getting pregnant, hehe, so try to get on birth control if you can : )