My honeymoon phase lasts for 1 night of sex only

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How do I fix my head?
I have everything already from looks to charisma to being financially stable(not rich, but doing well enough that I can afford stuff I want) except for a "real" romantic relationship with a woman.
The problem is, while courting someone I always go the distance, but after I get to fuck the woman all the "feelings" disappear, they probably weren't feeling in the first place.
It doesn't matter how great of a person or how beautiful the woman is, after fucking once I get bored immediately.

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I came to realize this after meeting a Japanese woman who I swear to fucking god is so pretty and kind, not to mention she's also a singer in Japan but is just traveling. I did the usual courting shit people do, dating, going out, whatever the fuck else. Then came the other day where we spent 2 nights and 1 day fucking the shit out of each other. I just arrived home, we're still messaging each other, but what I felt the past couple of weeks is now completely gone and I just want to find someone else again.

Is finding a partner really even necessary?