Women are easy? What's wrong with you?? He's chosen to be with this girl so far, his idea of partying might actually be just once a week and not every night.
I told me then boyfriend 3 months in I loved him, 8 years later we're together and have 2 children - oh and we're married! Fact is only you can answer this question. You know if you can see yourself with her, if it feels right. Fact that you feel you need to ask a bunch of strangers on a steroid site suggests you're not ready to be with her. If you want to be with someone you just know and would'nt give a damn what your friends would say let alone a bunch of strangers.
Don't listen to anyone, just trust your own judgement. Life is about creating memories I heard someone once say, so go get you some!
Your right, I apologize for the generalized statement. But the easy comment came from being on and off college campuses for the last 5 years of my life. Admittedly its generated a tainted view in my eyes of the average girl in certain scenarios. You may be an exception, this girl he is with may be an exception. But I am a raw data kinda guy. 5 men beat 1 man in a fight basically, even though its possible 1 man could beat 5 and other factors come in such as weapons and situation etc. But the raw data is 5 will win in a normal scenario. Girls who go to bars at least every weekend, have issues. Guys who go to bars every weekend, know this and go to bars for that reason lol. Does the girl have daddy issues? Because if so, cut and run even faster. You can't fix that crap.
I would say going out every weekend spells doom for any relationship. I know some happily married couples, and I know the trouble couples or girls and guys who never seem the get it right. There are some pretty strict "Generalizations" that show up. Kind of like if you look at a prison census report, but of course we cant talk about statistics because...well...you know talking about statistics always makes you racist, or sexist, or something.
BTW saying you love someone after 3 months is pretty much a good thing. If by that point you don't love them...there are issues. Talking about marriage is a show of a deep need, one that if your away for a long business trip she will find that need from another guy until you get back.
Its nothing against women, I hate humans in general

We just happen to be on the subject of party girls to my understanding. I made the easy comment mostly because I see quite a few ladies who are in relationships who cheat when they are "out partying". Even seem some scum bag POS husbands and wives cheat. Which in my books, we should hang em from a street light in front of heavy semi-truck traffic.
One of the most brilliant women I know, who has been married for about 12 years and has a great family simply told me once. "You never have issues, if you never place yourself in a position for issues to develop".
But today in a liberalized society that is not the norm...
Like I said to each their own, and its my opinion. But I don't date a girl who parties...and honestly probably wont date one who "Partied" in her younger days. Thats me, there are plenty of women who don't walk that path out there with a lil more dignity and alot less mileage.
Guys like me get tired of helping their friends out who date girls like that...after they give them a STD, or get preggo and then leave and rape em for child support, or get their heart caught up then rip it apart, screw dudes in the very house of the guy they are living with, etc,etc,etc.
I have not been wrong yet in my real world advise to friends, sometimes all the way to the the period of my predictions. Such as me warning a buddy his girl was NOT taking her birth control because she wanted to trap him because she felt they were drifting apart...BAM, hello smaller paychecks. Or warning a buddy his girl is cheating, going to leave him, and he should not have got an SUV so they could drive their kids around(They each had one)...BAM, now he owes me money from me bailing his @ss out because his tools almost got repo'd for work, he has no cell, and a junk car because that SUV got repo'd...And advice I give to girls too about the guys they date, similar situations happen..Especially when they choose white trash. But eh, I adapted a "I don't give a fk" anymore attitude. Dumb people are dumb people who cant see the writing on the walls.
Take it or leave it, you can be offended at the comment I made about girls...but its kept me on a road where I am climbing to the top, while many around me have gotten tied down by baggage.