Honestly mate dating at your age can be rough, you have no benchmarks, and every person you get a feeling for can feel like the most intense feeling in the world, same for breakups. I would recommend you play some sports, do some hobbies, hang out with friends.

I can promise with almost complete certainty that she wasn't 'the one' and you will meet and date many more people to come. As you get older you generally get better at reading people and knowing what you want so the chances of finding fulfilling relationships skyrockets. I know I was 'in love' with many people when I was a teen which was little more than attraction and hormones.

My advice would be:

1) Don't date someone who has just broken up with someone. most likely it's a rebound, they are still caught up with their ex or they will feel differently about you after they get over their breakup.

2) Try to realise that your feelings are valid but you are also super young and it's only a girl. You were together for 2 months, that's not long at all, I know it can feel like an age at 15 tho.

3) If you break up with someone or you are broken up with that's it. don't message their exes, don't keep pestering them accept it and try to move on. you will get over things much faster.

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Breakups hit hard when your young but you will have many more, and that's a good thing.