I'm not sure I'm best placed to give relationship advice, I've been with Mrs atm since I was 15, its all about mutual trust and feeling secure. We dont go out partying these days but i never liked other blokes trying to chat her up, but I'd generally leave it alone for a bit if they hung about to long I'd go over and make sure she was OK with it, I would know when she wanted me to get them to fek off and would ensure that happened without any fuss.
She would always laugh at women trying to chat me up, on the rare occasion it would happen s I rarely noticed, I'd be far more interested in dancing and messing about but we only went out to raves, I didn't have to deal with pubs and cattle market night clubs.
Talking about it is the only thing you can do, relationships are built on mutual trust but the green eyed monster is bound to be lurking, she must have blokes talking to her, how dos she react does she chat to them, I know I'm a jealous bastard so I've always tried to keep it in check.
One night many moons ago I was in the doing my usual "out of control dancin like a loon and 100MPH" bit in a club in Dalston we used to go to sometimes and my missus was standing a bit further back having a drink and cooling off and some bloke starts talking to her, I notice as I he's there for while a while and I'm rushin like a steam train and doing my spining round while dancin like a loon bit. The this bloke point over at me, I assume my missus is telling him she is with me, I assume that maybe he is getting a bit heavy leave it a minute or two and and walk over. I'm friendly enough with the bloke but as usual he feks off fairly quick (I looked could look quite menacing, apparently!) Actually the bloke juts pointed me out in the crowd to my missus and said " have you seen that butter over there he must be off his face"
to which she replied "seen him, I'm fucking married to him"
Keep talking try not to let it become an issue,these things have habit of festering if swept under the carpet