Ok, I have to be the negative one here. I used to be "that girl" too. The one that would push aside her own feelings for others. My 'sister' (bf) and I were friends for almost 20 yrs. Every time she had a special place to be (prom, dances, dates) she asked me to do her hair. She decided to get married and asked me to be her MoH and do her hair. The MORNING of the wedding I came over to do her hair and she already had her mother in law fixing it. I was hurt, but I was cool with that b'c I thought she was bonding. Then she told me she was glad I was there, which made everything all better... until she said, my dress needs hemming. It'll probably take you all day, so I've asked my MoL to take your place in the wedding. WTF? The only reason I still got to be in the wedding is b'c the store was sold out of the 250$ dresses that the rest of the wedding party were wearing and she wanted us to match. I wanted to tell her to shove the wedding up her you know what... but I didn't. I stood there like a good girl b'c I loved her. Years later (and many more "let me use you" stories) and I finally admitted to myself that she was my friend out of convenience and my willingness to do anything for her. I regretted letting her make me feel like that and yet still standing in her wedding for her (so we would match ). That's just me... you are more than justified with your feelings. I've been married... twice. I know what it feels like to plan a wedding, and I can't justify complete and utter selfishness just b'c your excited.
I hope your friend is a different story than mine.