THE OTHER GUY IS BETTER THAN ME

Men who have been in this situation with a woman they pursued, how do you deal with this?

Backstory:

I(24M) met this girl through a mutual friend(her cousin) earlier in the year. We instantly clicked. She understood my jokes and we flirted a lot. I didn't wanna rush things though because I also didn't want to scare her off. I still didn't take my foot off the gas and made it clear that I liked her and I thought she did too. We trained together and I want you to picture those gym videos where you think well those two are definitely a couple because my hands often lost their way around her body and found themselves in some dangerous regions.

So I finally made my move after 3 months and asked her to come to my place. Lo and behold, she says "No". This came as a shock because rarely in my life have I ever been so wrong about matters of the heart. She said she wasn't ready to leave her mum's place ata kama ako forty.(She's 23). She also refused to see me for when I asked her to at least come and talk to me f2f. I decided to cut contact with her.

Fast forward a month later, I meet her with another guy. This dude lives around 10 min to my right while the girl lives around 10 min to my left. He is an acquaintance since we play Fifa together and the mfucker has beaten me like 90% of our games and sometimes he volunteers to pay for some games even though he lost. He has even held small tournaments at his place so I have been to his house.

I didn't know the two were an item until I saw them later on that night past 11pm while I was at the balcony. She was in his arms like a little kid. Nilishikwa na kizunguzungu and a certain wave of jealousy that I've never felt before. The other guy lives in a better apartment than me, he's tall, brown, has short dreads and he is the typical sweatpants with sandals dude. On paper, I cannot compete with this dude and I can't get it out of my mind partly because the girl who was prepared to stay home till she's 40 doesn't seem too keen on that anymore.

I met her once near the dude's place while she wanted to go in and the awkward look that we gave each other bana, I hate feeling like that. Anytime I meet the dude while playing Fifa nowadays I play with a lot of feelings and I end up losing even more. I can't start a random fight with him because he's a genuinely nice guy.

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Seriously, how do I move on from this situation?

Diversion: Apparently the mutual friend(her cousin) who introduced us had a thing for me but I didn't like her like that. I don't now if I was rejected because of this. After my rejection, she also started being cold towards me so I bet women talk and now the two friends I had are like strangers to me