Does sex life die out as the relationship gets longer?

I’m just wondering since my boyfriend and I have been in a LDR for 1.5 years and he always wants to do stuff with me to fulfill his needs. We fought today about how I didn’t understand the importance of how fapping together is the closest physical affection he can get from me. I guess it’s just me, I used to have a high sex drive but now not so much. When we do see each other we end up having sex basically everyday. But when we part ways (he goes back home) I don’t feel the need to do kinky stuff over our calls whatsoever. The last time we did stuff was like 2 weeks ago. Am I being selfish? Be honest please!

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