I sense somebody is jealous you get to go out and pick up while their fiancee is having them on a short leash
It's just their insecurity and envy coming through. You don't have to prove anything to them, but if you're bragging with your conquests, then expect them to piss on your parade because they're envious.
My advice is, don't brag. If they ask about it, just smirk and say it's been going very well. The same with your looks, if they tease, just smirk and say, well it's working for me.
Otherwise, any comments towards the girl, you just say, well I like her, she's been amazing.
Don't get into defensive mode or explain yourself to them. Those who can, do. Those who can't criticize. Just remember that every time they try to bring you down with their comments. Don't let it get to you, they wish they were in your shoes, but they're not. It's you who worked on your game and it's you who is having success with women.
Anyways, if they push and push with the criticism, call out the bullshit and tell them their envy is really transparent. When they start to explain themselves, just brush it of with a "cool story brah" kinda of attitude.