Girlfriend obsessed with Xbox?

Ok I have asked this question before but I thought I should give more detail because some answers were uming left out details. Ok so I am an 18 year old guy and I have been with my girlfriend (17) for almost 6 months (6 month coming up in a couple weeks). We really love each other and I really want to be with her but there's one big problem: Xbox. I will try to explain the situation with a non-biased view and present both sides of the argument best I can so you can accurately answer it. One of the main reasons we are together is because of all our similar interests and we are both kind, good-nature people. One of these similar interests is video games, which I was actually glad about at first, but not anymore. About 3 months after we started going out, she bought an Xbox for herself to play Halo: Reach. I also like this game but whenever she gets on Xbox Live she plays and talks with random guys she met online 90% of the time and me maybe 10% (probably less actually). I am on a lot especially since it is summer so I am almost always on when she is but she still chooses to invite and play with them. I am not trying to be clingy or anything and I understand that she doesn't only want to play with me, which is perfectly fine; it's just that she very rarely chooses to play with me after months of saying oh we will play every day before she got an Xbox. Another thing is we text ALL DAY and I mean like a couple hundred a day (every 5 min I get a text basically and I reply right away). Before she got Xbox, I was running on 300 texts between us every day (roughly) but as soon as she got an Xbox, it dropped down to 50 or 100 every day. I will send a text and instead of a 5 min wait for a reply, it went up to 15-20 min and the reply is usually one word, so if I said something it is lol or haha (sometimes even if it is a question which doesn't make sense). It seems like she just hits a few ons in between games and doesn't care what she says and doesn't think about it. Now I don't care if she doesn't give immediate responses, but these half-ed responses are a bit much. "How are you?" "Haha" I mean wtf, really? The worst part is that on top of all this, our "dates" mostly comprise of me watching her play Xbox at one of our houses. If I ask her what she wants to do, she always says lets go to your house and watch a movie together or something. Well we did maybe twice, but the other 5 times she came over to "watch a movie" she took the Xbox over instead and I sat there for 2 hours watching her play and she zoned out completely and wouldn't talk much. I have offered to take her to the beach or to a movie or stuff like that but she usually still says lets do something at your house. It just seems like no matter what she just wants as much Xbox time as she can get. Also, she chooses my house because she is limited to 3 hours at her house by her mom, so she wants more hours most likely at my house. One more thing, if her mom goes anywhere for several hours she hides the console and controllers which makes me glad, but then she looks for them and plays even then and sometimes this means all day (no seeing her all day then and you can forget about any decent text conversations). I want her to enjoy herself, but it is just too much lately. Am I being too critical of the situation? I mean I understand she likes to play, but it seems like she would rather play Reach than talk to me or be with me. What do you think? Also our 6 month is coming up and I think I will probably break up with her if she suggests going to my house and then hogs the Xbox instead of going somewhere since its our 6 month... Thanks for any help!