How do you know if someone's feelings are genuine?

@IWasCallingYaLarry That only leaves you bitter though and you’ll end up pushing everyone away.

@Menetics Uhuh. Yeah. I know. I've had people who I became close with who pretended to love and care about me so much and tried to make plans to hang out with her and others around me, only for her or whoever else to not hmu back about plans we made, and to ignore me after a while meanwhile having no problems going away to upstate or another state on vacations with other friends and her boyfriend. I've been in fake friendships like that with people. And I ultimately walked away. So yeah, I do have reasons why I just assume everyone is lying.