Getty/Facebook/Johnnie Faye Cartwright Composite

Things seriously blew up between Zachery Ty Bryan and his girlfriend before their arrests this weekend -- and TMZ's got the messy play-by-play ... and honestly, it seems like the "Home Improvement" star’s lucky to be alive.

Lane County Sheriff’s deputies tell us they responded to a reckless-endangering call near a camping area outside Lowell, Oregon, on Saturday -- where they found Zachary in a pickup truck with his fiancée, Johnnie Faye Cartwright , and their three small children. Facebook/Johnnie Faye Cartwright

Deputies say they learned that earlier, Bryan stepped out of the pickup and started walking along Big Fall Creek Road ... and that’s when Cartwright allegedly hit the gas, aimed the truck at him, and ended up crashi

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