Yes, yes, I understand what you're talking about. (And I did mention that I go to most of the games with my buddy.) I just figured it would help our relationship to get my gal at least semi-interested since I'm a season ticket holder and watch so many other games during the season. We don't live together (yet), so if our together time is going to involve football, I'd rather have her with me than against me, if you know what I mean. So far, she's into exploring what it's all about.
1st bold: Ahhhh, gotcha. Not living together, you're still (relatively) new to the relationship in the way that you still enjoy every second you get to spend with her because you don't spend EVERY seceond with her, so you're willing to sacrafice man-time to spend more time with her! Hoozah to you!
2nd bold: (the 07 SB was a bad time in my household, I know EXACTLY what you mean)
However, just be aware of the future consequences of such actions.
If you get her used to going to games/watching games with you, once you finally DO move in/get married, your #1 excuse to escape and see your buddies once a week is now down the toilet.
Now I will say this, having a wife enjoying the same "manly" thing as you can in fact be a plus as well. I got my wife to enjoy watching MMA with me and while she isn't an aficionado, I enjoy watching the fights with her more than my guy friends as I just love watching her smile as people get their faces smashed
This could be the same with you and your girlfriend with football! Who knows, but like I said, just have a back up excuse for guy time in the future. I suggest joining a poker league or something of that sort.
Summary: if she's remotely interested in football, but doesn't "have a team" I fully encourage you to make her a Pats fan, but if she has little to no interest in football I think you are shooting your future self in the foot!
Either way, I hope you both enjoy your time at games and your future together!