The Gambler (1974)

Successful college professor Axel Freed is addicted to gambling; he wins big but loses it all just as quickly. He borrows from his girlfriend then from his wealthy mother, and finally from a loan shark. It just gets worse and worse for him because he just cannot stop. But when his girlfriend decides to leave him, his mom decides to disown him, and the mob wants to kill him, he decides to make a big score to win big and pay off everyone so he can stay alive, keep his dignity, and come out ahead.