very true... if my sister's bf did that to me (although she doesn't have a bf yet), and i'm assuming that I also like him. I'll have to face the risk... of a) ruining my relationship with my sister b) who knows.. what if the guy likes my sister back??! c) I have a bf d) ppl will think that I "stole" my sister's bf!
Anyways... taking out your gf's sister out of the equation... if you aren't satisfied with your gf -- not being able to communicate and discuss things with you enough..., and whatever bad qualities she may have... will you break up with her?
Or will you not?
I'm not sure if it's the case.. but this is what I think.
You just need attention. Because your gf is not giving enough attention and support to you, and her sister does, that's why you feel like you guys are better together. The thing is.. your gf is working her butt off at work (well you said she's always busy... so I guess work? Or what... meeting w/ her friends?), while you play with her little sister. Perhaps YOU should be a better boyfriend and give more attention and support to your girlfriend! Just because she doesn't go on to talk about philosophical issues, doesn't mean she's shallow.. perhaps she's just too busy for them... maybe when she's with you, she just wants to relax her mind and enjoy your presence.
And at the same time.. since the sister is having a long distance relationship with her boyfriend.. perhaps she's just looking for someone to talk to and stuff.... and voila... you're available. Personally, I don't think the relationship will work out if you do become couples (sister and you), because... it'll just be a relationship out of convenience. And who knows... maybe when you are separated some time in the future because of work or something... then maybe she'll find another guy and dump you-- and you wouldn't want that do you?
So, in conclusion... this is what I think you should do.
1) ask yourself if you love your girlfriend.
If Yes, stay with her, be good to her, don't think or do anything else
If No, you don't love her, but are still satisfied with her-- that's still not bad! But if you can't imagine marrying her and being loyal to her for the rest of your life, etc. Then break with her -- breaking up with her.. because you don't like her anymore.. don't break up with her using her sister as an excuse.
2) If you do break up with her. Let things cool down for awhile... see if you can still be friends with her sister... Perhaps she may break up with her boyfriend.. maybe not... if you still like her sister- go for her --- or better yet, go date some other girls first so others wouldn't know that you broke up with you girlfriend because of her sister. And who knows.. you may not like her sister anymore after this stage! And you get on with your life~.
So basically, you can stay with your girlfriend, and may regret later on in life.
OR you can get her sister and may regret later on in life... when you do realize that you actually love your current girlfriend, OR get someone else and may still regret later on in life.
Think things out before you say anything... this sister loving thing may just be a phase.