Supervisor wants my paper in another conference, but I have paid for travel for the current one
There is only one solution: 


The paper has been accepted on first conference.
You paid for going there
You go there and present the paper.
Withdraw from second conference ASAP (like Monday morning after notifying your adrvisor).
Search for new advisor, because him a) advising double (or multiple) submission of the same paper and b) pay travel costs from your own pocket for first conference, shows he knows nothing about how academia works.