That's how gambling works and this is why one has to set a limit to what you can gamble with within a day, week or month base on your capacity. This isn't applicable to only online gambling alone but also include street card or dice gambling. The more you lose, the more you wish to play to recover for your loses. Also the more you win, the more you play believing you can make more.
Basically, gambling has a system to determine a gambler's win and loss and from this system the gambler must always maintain his awareness when he wants to place a bet, by looking at the limits of our ability to place a bet, of course this also greatly influences whether we gamble. excessive or not.
And keep in mind that we cannot ask for this system, but we as gamblers must be able to accept what the system will issue.