Cardi B spent Valentine's Day with her estranged husband, Offset -- and while they don't look very estranged here ... they have yet to definitively confirm they're back together.

The rapper's been keeping fans guessing about her relationship status with her hubby lately --- spending time with him on key dates such as Xmas and New Year's ... and even letting everyone know they've banged as of late -- despite having announced their split in early December.

Well, this is just the latest confusing curveball -- they were at it again with mixed signals for Valentine's Day ... hitting up Carbone in Miami Beach for the lovey-dovey holiday Wednesday.

Check it out, the pair arrived at the Italian eatery together ... and Offset went inside a few minutes after Cardi, seemingly trying to stagger themselves.

He was clearly taking his time to greet fans/onlookers, even sharing a hug with one of them. In the end, however, they emerged together after midnight, with Cardi holding her phone up to her face while signing some autographs before they headed into their vehicle together.

So, yeah ... they're together -- no questioning it now at this point, especially on V-day.

Of course, we know Cardi's gone off on people speculating on where things stand between them -- she's gone on online tirades on Twitter randos, at times suggesting they are NOT, in fact, together. Yes, it's all very confusing -- and they haven't provided much clarity.

Whatever the hell is going on -- obviously, they're on good enough terms to hang on a very special day in the year that's for lovers ... so you can draw your own conclusions.