I'm a pretty affectionate person, but my girlfriend doesn't feel like she needs to be. What's the best way to approach this?

It feels like I put in so much work to be the best boyfriend I can be, but she doesn't acknowledge or appreciate any of it. She doesn't really make any effort to show me she loves me, and I'm starting to feel like a total jerk for expecting it. She's a wonderful person and I'm happy that I'm with her, but recently it's just been extremely unfulfilling with no signs of changing.

I'm a pretty affectionate person, but my girlfriend doesn't feel like she needs to be. What's the best way to approach this?
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