Why are my friends acting so weird like this?

This has been bothered me for so long. So, when me and friends are leaving eachother saying goodbye, they would say "I love you" and when I say I love you too back to them, they turned their face away and looking like they're offended.

Should I have not said that or should I just ignore what they said. I love all my friends and have feelings for them, but why are they like this?
Why are my friends acting so weird like this?
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