Separate or joint acct?

My Gf n I been dating for 2.5 yrs. Six mths ago we decide to have a joint acct but living separate (i worked two hrs away) n looking toward the future n moving in soon. So every paycheck I would give her for bill,saving, n etc. I would only take what I need to live where I was at, very little. About a mths ago we move in things were good. She knows I enjoy going to okay Texas holdem as entertainment. One night (haven't played) I asked her to go n played.she didn't want to go n said if u want go without me. After asking n confirming several time I dropped her off n told her i was playing low limit 40 bucks,then left. Got there no low limit table only 100 n up....didn't want to wait seat open sat 100 table played tlfor 2 he's lost left got home midnight. She ask how much I lost, told her 100 bucks she blew up n told me could if bought her flowers, perfume etc......... I simply said I ask u u said yes so I left ..she said u were to use 40 not 100 I said no low only high limit table b okay.didn't think it was a big deal...I said I give u all my checks I don't take a single penny ..it was entertainment .so for several day we didn't speak. berfore I could even suggested we have a joint n separate acct. she said I wanted to surprise you I have some money saved. I ask where is it? Its not in the acct. She said it in a safety box. Then I suggested the acct. She blew up n said no. She not living with separate acct one acct only. but the box is under her name only. So then after moving in for one mths I moved out cuz we couldn't agree.......us this selfish of me n I'm being unreasonable. By the way I didn't take any of the saving she saved ...