Haven't meet my brothers new girlfriend, but i question the Relationship.

I found out a month ago that my brother has a new girlfriend but they have been together since February.[5 months] Even though he broke up with his ex girlfriend in February [2 weeks before getting with his new girlfriend] he was with his ex for 1 year 2 months and his ex was his first serious relationship. I know this sounds mean being a sister, but i have been questioning the whole thing since i found out. I don't see my brother a whole lot anymore unlike when he was with him ex, because he is always spending time in another town staying at his new gf's house and i only see him on a weekend for an hour. but i haven't yet meet his gf. and i don't know if my parents yet have either. but the reason I'm questioning, is because on his facebook, their relationship is 'Its complicated' -[he was tagged in the status rather then it showing on his profile, as its hidden.]and even though he spends almost every day at her flat, she doesn't actually live in england from what i know and is going back home next month. and was in england for a year to study. When he was with his ex girlfriend, they meet through a friend that me and my brother work with and i also meet his ex only a month after they got together and his ex also meet the whole of my family in that time too. they spend a long time together, was always around me and my parents every weekend and his ex got on very well with my family and me, but he then suddenly dumped her and feel bad for his ex, because she was a lovely girl which my family loved too, and she treated him like gold and they was perfect together, but he just suddenly left her..and i dont know why. So im now kind of wondering why my brother hasn't introduced his new gf to anyone of my family yet [from what i know he hasn't]. I know this maybe harsh, but i don't know if their relationship is that serious, because it seems like friends with benefits or even a cover up for my brother to get over his ex like a rebound. I don't normally care about this stuff, but i care alot about my brother of course and my family are pretty strict on things and how we do things and i think they won't like some of the stuff his new gf does. because my family hate tattoos,piercing and smokers. To some people we haven been brought up strictly. but we haven't, we have just been brought up so we do well in life,respect others and know what right and wrong is. And that another question on why he's gone down a route where theres things my family will hate. But how long or when do you introduce your bf/gf to your family? and why could i of not meet his gf yet?

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