Help? Advice something

So my boyfriemd and i have had sex maybe 8 ..9 times..mostly oral n out of those times he came we searched it up n he said it was cause he masturbates too much. Thn he said it was cuz he can only cum laying down....the guy i was with before this boyfriend never came either n im starting to think its me....i do everything he wants to help kno...finish but he just wont...n i hope to someday have kids with him but we just dnt y he cant finish :/