So do something - like visit the love interest - that differentiates between these cases.
I know someone in a similar situation. She's been abroad to see her "love" in Egypt regularly, and he's very attentive when she's there.
Of course they're planning to get married.
Of course it's love. What else would it be?
Works on guys too. I know someone else who has given rather a lot of money to an East European woman. I don't think they'll ever meet, because most East European women in these scams are actually criminal gangs. But we'll see.
Also, it's worth considering that these scams are marketing funnels designed to select the most gullible people and filter out everyone else. So the victims are self-selecting, because the scams are designed to find people with their particular psychological weaknesses.
So you need a much better differential when you sarcastically say "of course it's love".