Getting cut from a team you and your friend tried out for.?

So me and my friend tried out for rep softball together and we made a deal that if one doesnt make it the other doesnt play on that team. Turns out i didnt make it and she did. Now it seems like she wants to go play with them but she doesnt want to leave me. Iwant to be a good friend and supportive but its so hard. We have played together for years she has always been my catcher and now it just seems so weird to think of someone else doing her job. Im so upset and Im trying to be happy for her but i just cant. What should I do?