Im afraid that my girlfriend will get bored of me in the far future even tho she promised that?

AkumaKira
Before I begin, please dont hate for things like "We want to be together forever" okay? I know Im 16.
But still...
So me and my girlfriend were a couple for 2 months one year ago. We broke up due to family reasons of hers and both waiting for this year. We got back together and now we've been together for 2 months again. We have discussed many things together. She told me at one of them that an uncle of hers is now around 60 y. o. and he has been with his wife since he was 15. I have a friend too who's 26 and he's 10 years with his girlfriend and they're about to get serious. We have told each other how much we liked that. We want to be like that. Like her uncle. Like my friend. And longer.
She wrote me a letter saying some personal things about us (wont point out due to respect) and she promised me to be with me forever.. by my side. she even wrote the chorus of the song I wrote her one year ago.
This is where I feel bad. I love her with more than my whole heart. But I dont know why Im worried that she might get bored sometime. We had a talk some days ago and she was worried about that too. I think she is still worried.
There are actually some things that make me worry. First, I can see sometimes she's bored when we're out if we dont talk much. She has even told me to say something so she doesn't get bored. Another thing is, even though she was the first to say I love you (and the way she told me that made me very happy) she doesn't say it often now. I have to say it first and then she will say I love you more and such. Yesterday she didn't say it at all even tho I did.
I dont know, Im kind of an overthinker but things like that make me worry and I need to be shown love. What can I do?
Im afraid that my girlfriend will get bored of me in the far future even tho she promised that?
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