Which provinces? It sounds like they took a mission - the one to take Italy, for example.
No I was playing multiplayer and a friend of mine had basically all land upwards of Frankfurt/Mainz steching from the Netherlands to Poland. I held all the land below Mainz from France's border (all of Milan/Savoy/Switzerland) to Hungary. Suddenly France turned from best ally to -200 hostile and the reason given was that they "want my provinces" and they didn't want any specific province, it was some absurd number like 50-60 provinces and when I used the diplomatic mapode and selected France then they had the yellow stripes over every single one of my provinces. It was late-ish in the game so I thought maybe it had to do with the imperialism casus belli or something. And this didn't just happen once, it happened twice in my game. First allies then -200 and they want all my shit. Then they get distracted by some war or other and suddenly the "wants your provinces" modifier is gone. I improve relations etc. etc. and re-ally them again. Half a century later the same thing happens again, they break the alliance (despite me being careful to keep it well into the +100-150 range), they turn super hostile and want absolutely everything I own. So it's not like I neglected our relations until they dropped into the negative zone, broke the alliance as a result of that and then rivaled / coveted all of my provinces, I had a super good relationship and then they backstabbed me completely out of the blue.
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