I (20F) don’t want to marry my boyfriend (20M)

When i was a kid i never dreamed about getting married or having children. when i met my boyfriend at 18 the first thing i told him was i never want children or to get married and that nothing will change my mind. fast forward my boyfriend is now trying to go into the army. he continues to tell me that if we get married i will get a lot of money. but i said no. i thought it was left at that but no. he had continued to talk about it for days, he’s told his friends and they are calling me hateful names. my boyfriend thinks i don’t love him because i don’t want to get married which isn’t true at all. i love him very much but i just don’t care for marriage. and if i ever was to get married it’s not going to be for money. but he just won’t stop asking me and telling me rude things. how do we go about this?

TL;DR My boyfriend (20M) wants to marry me (20F) so i will get paid money from the army. but i never want to get married. how do we go about this?