If somebody refuses to be nice is it Jealousy / Stinginess?

I have two female cousins who refuse to reply to emails or texts I send them when a response takes under 3 minutes and in university there was a prayer leader who would spend hours lecturing me about the bible but refuse ever request I made to receive prayer or join his prayer group, he did not have time to pray for me but had plenty of time to criticize me. I think that they might have a secret and vindictive desire to see me fail because they are jealous that my life is easier than there’s and they believe I deserve to have nothing good in life. Like a stingy guy who refuses to share his food with strangers cause he doesn’t think they deserve it.
If somebody refuses to be nice is it Jealousy / Stinginess?
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