head gaskets generally shouldn't be re-used so yes I'd agree thats likely to be the fault
Once you've got the head off again I'd also use a straight edge to check the block and head faces for flatness and checking the edges of the casting for any burrs or raised edges that could hold the head and block apart
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that may well be the case
The other thing to try is a head gasket / block test kit as these take a coolant sample and analyse it for any signs of combustion gas - if present this would indicate a possible crack in the head thats leaking into the water jacket
now if it is cracked what would be worth trying is a bottle of this sealent
I've used it myself and its quite remarkable stuff - an engine that had water jetting out of the head joint stopped leaking and went on to do 20K miles before my wife then crashed the car