Burebista

[Merlkir]

Burebista also probably wanted to rather avoid a conflict with Rome if possible, although we know he expected the invasion - a large number of mountain forts was built around this time.
If Caesar was defeated, as diegis points out, there may have been less of a chance of a roman invasion. A rather ironic twist of fate - shortly after (iirc, I've read a book abouit recently, but I don't have it here to quote from) Caesar's assassination, Burebista was also murdered by a group of unsatisfied tribal chieftains.

The Dacians had bad luck betting on the winner of this roman civil war anyways, I recall they tried to ally themselves with Brutus as well.