I wouldn't' keep driving it in this condition; it sounds like you have a water cooling system leak, if it is coming out on the passenger side of the engine, under the harmonic balancer/crank pulley, it is most likely your waterpump is leaking, needs replaced. If you keep driving a vehicle with a cooling system leak; it will eventually, cause engine damage and can cause a warped head, blown head gasket (thousands in repair costs).
If you are unable to do this type of work yourself; I recommend, you have the vehicle towed to a shop that specializes in VW's or a repair shop you trust. Typically, a cooling system pressure test; will help identify, the source of the leak and then, appropriate replacement parts and repairs, should be done.
Stop driving till it is fixed or you will ruin your engine if you haven’t already. It could be something as simple as a broken/cracked hose, bad or leaking thermostat or more involved like a water pump or leaking head gasket. Find someone to diagnose it ASAP.
You cannot allow a vw to want for regular maintenance. My 2005 MK4 will cross 400k miles this month. It has been the most reliable car I have ever owned, HOWEVER, I do not let anything go, hoping it will magically heal itself.
An 05 jetta could be the MK4 platform with the BEW engine which requires special oil (505.01] and has a know cam issue. The Jetta changed mid year to 2005.5 which is an mk5 platform with the BRM engine and a known cam issue and also requires a special oil.
Owning a vw requires “maintenance vigilance “ as I suppose any car does. Very rarely does an out of the ordinary noise go away on its own.
From 99 till about 07 or 08 it’s a good idea not to buy a vw with an auto transmission as the most common failure point especially with a tdi is the auto transmission . 500 thousand mile engine coupled with a 50k mile auto tranny. (Hyperbole added)
I consider vw to be equal to other major brands as far as reliability but then I consider the 99.5-06 tdi’s with the 5 spd manual to be the best all round cars ever made. Golf, Jetta or Beetle.