making her jealous and demanding that she decide now are both surefire ways to lose her... if she's not over her ex, there is NOTHING you can or should do about it... her ex is HER problem and having you interfere could mean that she never fully resolves it... so... either be patient and DON'T MENTION ANYTHING or forget about it... plus, if in the end, she decides you're both better off staying friends, DEAL! the relationship takes TWO people to make and you can't force her into one when she just doesn't want to... the hardest option is being patient but can possible pay off the most at the end... good luck
In my opinion, you need to let the waters calm before you go diving in and trying to make waves with this new girl.
You made a snap decision to leave your previous relationship because you felt this girl was "the one" for you before getting to know her...am I right?
Not only did you not give YOURSELF time to heal from the failed relationship with GF#1, or sit down to consider the options/ramifications of what leaving her for another girl would mean, but you tried to step into another relationship right away with her cousin ( I wont even mention the difficulties THAT could cause)...and she's not over her previous man.
Sticky situation and you need to let potential GF#2 have her time to be wishy washy over her old BF before she walks into your arms. There IS some truth to those cliches you know...and you don't want to be a rebound man!
Of course, this is all just in my own humble opinion.
Best of luck,
smiles