My sister boyfriend is way too protective fo me... how can i get him to trust/like my new boyfriend?

My sister is four years older than me - she's twenty-two and her boyfriend is twenty-three. They've been together since i was ten so he's like a brother to me and i actualy do consider him my brother. We get on so well and he's so funny and i've spent so much time with him over the years. We quite often just hang out like a brother and sister would, it's great, i love him, if my sister and him broke up i know we'd keep in touch. The issue is he does get so over-protective of me, like there's nice things like if i'm coming home from a party or a night out he'll always come pcik me up or whatever, but there was once this time where i was really drunk and i was waiting for him a to pick me up outside this party and i was talking to this guy and we ended up just drunk kissing, and before i knew it i was being dragged into the car and being told how 'careless' i was by my sisters boyfriend nd then he gave the guy the finger. Me, him and my sister have also gone to bars before now and if a guy approaches me at one fo them he'll be like 'sorry she's not interested, now run along pony boy'.. He makes jokes about it like 'no dating for charlotte until she's twenty-one', and i know he's joking but like i can tell he means it. Thing is i've got a new boyfriend and i really want them to meet eachother because they both mean alot to me but i'm scared my sisters boyfriend will be really unwelcoming to him. Haha, i find it funny how i'm not scared to take him home to my dad or mum or sister but to him i'm petrified. Sould i talk to him before? I knwo he's try his hardest if i did, but i just don't want to seem ungrateful of the fact that he cares abotu me like a sister so much?