Girls, Been dating 3.5 years. In the last two weeks she started using 🤍 instead of ❤️ In our texts…. What’s does this mean?

Just trying to decipher if she is subtly hinting at becoming more platonic or if she feels stronger for me…
Girls, Been dating 3.5 years. In the last two weeks she started using 🤍 instead of ❤️ In our texts…. What’s does this mean?
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