I still think they shouldn't have met behind your back this fast because you introduced them as friends not as a match, but at the same time, you need to acknowledge that not all of our wishes and desires come true. This guy obviously has made a decision you didn't like with or without the influence of your friend.

Your friend has been a friend with you for six months and you described her as a good and nice friend until this happened, while this guy you have known only for 2 weeks. I think the guy is more to blame than your friend, but probably your emotions don't allow you to see it this way.

You will get stronger as you get older and have experience in life. You don't need an excuse or an immediate alternative for your current relationship if you aren't happy. Set yourself free and explore other options that work for you.