Am I too attached to my sister?

Anonymous
I have been dating my girlfriend for a year. We both love each other immensely. She is 22 and I am 21.

I have a 27 year old sister who I am extremely close to. Growing up, she was my role model. She was living on the other side of the country but 3 months ago, she broke up with her boyfriend and moved about 4-5 hrs from home. She visits almost every weekend.

Whenever she comes over to visit me and my mother, obviously we spend a lot of time together. I used to spend these weekends with my girlfriend (who lives 40 min away) before and I think she got upset that I don't give as much time now that my sister is back. I made the change and now I do spend time with both of them and they're both happy.

Yesterday, my sister lost her job and she called me depressed and wanted to go on a cruise with me as a getaway in Dec. That pissed off my girlfriend since she has been wanting to go for a while but we never did. She is so mad that she told me she just can't take it.

Now I feel very guilty and I know if I go on this cruise, I'll feel guilty and hate myself for going since my girlfriend is annoyed and upset.

My question is, am I overly attached to my sister? Is it "wrong" for a brother to go on a 3-5 day cruise with his sister when he hasn't taken his girlfriend to one? I know I would be OK if my girlfriend went on a vacation with her sister but I guess girls see it differently.

And you might be asking "why can't you just go with the two of them?" ... I can ... and I probably will if I end up going on this cruise. I just want to know if I am overly attached to my sister or if my girlfriend is being unrealistic.
Updates
+1 y
I do understand my sister is needy which is why I make sure I give them both the appropriate amount of love and attention. But I am failing to see if I am at fault in this situation.
Am I too attached to my sister?
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