The handle assembly and collar (8) will thread off after pushed past the limit of the cartridge (gentle consistent pressure)...
In terms of leak itself its hard to say but if the faucet froze from sediment build up and is now leaking it is likely that part of the cartridge is 'clogged' open...
Answers & Comments
Here is a link to the repair parts page on Jado website for your faucet. Exploded diagram shows how the thing goes together...
http://www.jadousa.com/assets/repair/842001_repair.pdf
The handle assembly and collar (8) will thread off after pushed past the limit of the cartridge (gentle consistent pressure)...
In terms of leak itself its hard to say but if the faucet froze from sediment build up and is now leaking it is likely that part of the cartridge is 'clogged' open...
Hope that helps...