Situation
Some days ago I went to a concert of the band of a good friend, let's call him Alex. He and his bandmates, invited a lot of friends to support them. I know Alex pretty well since we've been working together closely for more than two years now and we also regularly spend our free time together. I know his non-work related friends only loosely. Alex and his friends live in a different town about 30-40km away from where I live and even further away from the place where the concert took place.
During the evening I had a very inspiring and long conversation with a girl, who I didn't know before, let's call her Anna. We talked about a lot of different topics and emerged to a more and more personal level. I somehow felt a connection between us. As it got later Anna was texted by her parents who were also in the city, that they are nearby and could take her home by car. We said goodbye and she left almost instantly, without exchanging any contact information.
The next day, I asked Alex if he knew her, he agreed and redirected me to one of his bandmates who sent me her phone number. I wouldn't have asked him if there was a probability of meeting her again somehow, but since she lives so far away it is pretty unlikely that we would meet again. I know I should have asked Anna personally for her number but since I am a really shy person and because she left so fast I didn't do it (shame on me).
Question
Now I am unsure about how I should text or call her without being seen as creepy or indecent, because I had to ask someone else for her number. Should I talk about the fact that I didn't get the number from her and about who gave it to me? What would be the best way to open a conversation?
My goal is to avoid an awkward situation.
I was thinking of writing something like this:
"Hi, here's Fimbulvetr, I really enjoyed our conversation at the concert. I would really like to repeat that. I really forgot to ask about your number so Alex bandmate XXX gave it to me, I hope that's ok for you."
Additional information
- I am a guy in my early twenties, she is one year younger than me
- This question is set in Germany if it matters
- The distances mentioned are not a problem but obviously too long to meet her again randomly
Update
I just wanted to give you a brief update on my situation. I know this question is almost two months old but nevertheless I think you deserve to know what happened :)
It turned out that Alex bandmate had already asked for her consent before giving me her number. So I wrote her a text (thanks to Laurel, Phoebe Phoebe, DaveMongoose and Stian Yttervik for your tips). Long story short we've met again and are texting on a daily basis.
Thank you all for your great ideas, you helped me very much.