Relationship with finance ?

In a relationship who agrees or disagree that finance should be together or separate. We were dating on n off for 2.5 yrs our money was together for about the past 6 months. About 3wks ago, after living together for 1mth, I had gone to the casino n spent $100 when i told her that I would spend $40. Bills were always paid n spending that's amount didn't hurt anything. This was the first time I spent any amount on anything for enjoyment. Before that's I asked her if she wanted to go (repeatedly),and she said no that I could go. After that I got home at midnight n got into an argument. After that things went down hill, I suggested to Jeep our finance separate n. Split all bills.she said no n she said she wont live like that. Since then I've moved out. Am I selfish to do so. I've dropped everything to b with her even giving up all my friends. It sounds stupid there's more, however I just want to hear people in this situation had done to figure a direction the same as me