Want to leave a perfect relationship

Hello. I am 19yo,, a female and I am currently at a 2.5 yo long distance relationship. Me and my partner are great. We have the only kind of relationship I would ever see myself in. They are the only type of person I can visualize a long term relationship with. The problem is, I feel like I have lost the excitement and the strong feelings I had in the start of our relationship. Also, I don’t feel like I want to be in such a serious relationship rn. My love for them is deep, I truly care for them and their happiness. But I can’t help myself but thinking about those problems I already mentioned. So I see it like a dilemma: being happy and taking risks I feel I want to take or losing a perfect partner and an excellent relationship just because I feel this way? Nobody can promise me I will find such an amazing person in the future. I truly believe they are my soulmate. But it is not what I want from life right now.

My partner wants to explore the world of course, but by my side. the idea of a break or even a break up makes them anxious and sad. Unlike me, they have perceived those strong emotions. Another reason why I feel like a b. As I have said before, I love them and I can’t handle the idea of them being sad.