Should I message number of girlfriend potentially being cheated on?

So this morning I had a call. A woman driving and I was at work. She said something that sounded like why is your number in my boyfriends WhatsApp?

She might have said husband. Was hard to hear and I was caught off guard and the call cut off.

Now it's driving me crazy not knowing! I don't use WhatsApp with many of my FBs. I've had tinder guys numbers. But none recent. I have work colleagues and messaged a few on WhatsApp in December for work related topic. Could be so innocent? Or not? But what would I even say now? Or better to leave it be?

Should I message number of girlfriend potentially being cheated on?
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