Does being in a relationship for 10 months mean you're expected to take things seriously for the long term?

I'm kinda freaking out. I've been with my girlfriend for 10 months, and I have no idea what I want long-term. I'm unsure if I'm ready for serious commitment or if she’s the one. The thought of breaking up terrifies me, and I’m feeling overwhelmed. Need advice!

Does being in a relationship for 10 months mean you're expected to take things seriously for the long term?
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