I do multi-bets and single-bets, every time I win, sometimes I forget myself and use all my $$ on the next bet. This sometimes gives me big wins, but if I'm unlucky I can lose all my funds and this has happened many times.
This means that you are greedy. Do not mind me that I said that. I was like this before. I can win 10x and still continue to bet with the total money that I have and my winning together on a single bet. I even remember a time that I bet like $1 up to when I won $35 and I lost all at ones. It is called greediness and it happens to addicted gamblers. You will need to stop that because you are chasing money and not fun.
Like anyone of us here won't be greedy on a win, i know how many times ive played a game again with my capital back once I win a game and that's cause I felt luck so I want to try again, let's admit it it's not so easy to walk away especially if you have been winning, everyone gets greedy at some point.
If it works for you fine, you can continue with that. Try to be a little more strict it would help you a lot.