They are clearly living together as a married couple raising Rogue as their daughter in Uncanny #170 (1983)
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There was no explicit mention, but it was definitely depicted, just under the radar.
Was actually just posting in another thread that reading back issues always surprises me how blatant some of what now is called "coding" was. Shatterstar in X-Force is on-panel said to be wondering if Rictor is more than a friend and their relationship is explicitly compared to the will-they-won't-they between Siryn and Warpath.
"Danielle... I intend to do something rash and violent." - Betsy Braddock
Krakoa, Arakko, and Otherworld forever!