whehehe...
Ask the girl using the 4 W's
What ? - What would you like to achieve in this relationship? What do you like? What do I like from You?
Why ? - Why do you need other girls? Why am I not enough for you? Why are you choosing this type of relationship?
When ? - When did you start being a bisexual? When would you like to end yor relationship with others? When will you start thinking about US - Just U & ME? When will I have you TIME only your time?
How ? - How would you like your life to be? How will it make you happy? How will you make me happy? How will i make you happy? How will i make you stop thinking about them?
hehehehe... Q's like those... Just Ask... there is nothing harm from asking... Atleast you will know from her directly... you will know the answers...