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Gator Reloaded
The older sister bogarted her opinion in the wrong way but although I do sense animosity, she's not completely wrong.
I'm sure you really enjoy your gf and probably expect to be together for a long time, however you should always examine the cons of a situation.
The biggest con if you guys move in together now? Her inexperience w/ living on her own, in her own spot.
Why? Have you ever had an ex that just did not want to leave you for some reason? Have you had friends, both male and female, who've given you horror stories about people they wanted to end the relationship w/ but couldn't because they would not let go.
If, but hopefully not, something were to happen where you don't want to be in a relationship with her anymore, how easy will it be for her to leave you alone, if she would deal with the fear of "being on her own." That alone may have her hanging around you...for security.
I don't know you, but unlike a lot of trolls on this site, I'm sure, kicking someone to the curb won't just be a walk in the park for you, simply because you care about her.
That may keep you in a relationship you don't want just because you don't want to inconvenience her.
And even worse case scenario? What happens if she's not feeling you anymore, however she won't want to leave the securty of having a home w/ 2 people contributing. You'll have a woman, who's growing apart from you, who doesn't want to leave you...but has mentally checked out, having her potentially getting piped out by someone else, while you are paying half the bills...
You might be wise to take some advice from the nosey ass sister b....