it is growing and growing. i wonder if i should transplant it to the ground or keep it in a pot.
Here is a link that might be useful: here is a pic.
Could it be ground nut vine aka Apios americana?
I think we saw the same vine on Name that Plant. If the leaves are opposite, it's likely a Clematis.
Do you have another view or more recent picture?
It looks like a passion vine to me.