Met him through a dating site, hinge.

At first it was all good and it genuinely felt like we were making a connection. He was a hongkonger. There will usually be some kind of excuse why he can't meet up physically even if he claims to be in sg. He will say he treasures the first meeting and wants it to be special.
Then after about a month, he started to ask if he could lead me to invest in cryptocurrency to help me earn money.

I believe he earns some kind of commission for how much people put in to these fake crypto brokers. At first below 10000 there was no issue withdrawing money from the platform. After that they will start giving you all sorts of excuses.

I also found out many others have come across such person's on dating apps sharing their experience in reddit. You can just Google "Hinge" investment scam.