Is this a bad sign?

my boyfriend removed the heart next to my name in his contact list and changed his background on his phone from a of me to something else, should I be worried?
Side bar: He helped some “single” girl (I don't know why he made the point to tell me that) put something together for her car, and I noticed it that night when he came back. In general, he has a lot of single female friends and I’m worried i might be making this a stretch because of that?
Is this a bad sign?
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