I hate to say, but that's actually part of how the scam works. I mentioned in another comment that it happened to a friend of mine and it was the same scenario. Hours on webcam for the first while until he figured it couldn't be a scam because he was talking to the same person every time and there were no signs of it being anything other than a great connection with another person.
But then once he was good and invested, the requests for money started. But not how you would assume they would if it was a scam. They started by being coupled with a refusal... "I don't have enough for both rent and groceries this week so I guess I'll have to go hungry. No no no. Don't send me any money. That's not what I'm asking. I don't need your help". Until they've somehow got you actually pushing to send them money.
And after that you realize that sending them little bits of cash you won't even miss will go so much further for them in Colombia and besides, it's all your idea so it can't possibly be a scam. And they were so grateful for your help that you're officially in a relationship now and don't couples share money anyways?
But then an emergency happens [...]