Well, for starters, he wasn't a friend, he was someone I knew on the forum as well as I know you now, which is almost nothing. But no, I don't think luck changes. He proved to be good at trades but making too many usually ends in screw ups like that one, that's why I was warning you about your trades on Betfury. Normally when you win it's best to take a break, we see too many stories on the forum where someone was winning, either in bets or trades, couldn't stop betting/trading and ended up losing everything. Enjoy the profits, you'll have plenty of time in the future to lose.
Nothing beats the adrenaline rush from the gains in our investments and wins in betting, but every time someone starts getting too excited, things start going wrong. That's why we must set a strategy from the beginning and stick to it strictly. No matter what happens.
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I totally agree that knowing when to stop is crucial. I often read stories on the forum where someone started off winning but ended up losing everything because they got carried away. Especially on Betfury, it's easy to get too excited. It's better to secure your profit and take a break. The thrill is great, but control matters more — or the joy disappears fast.