My name is Kameyama Junshi.
Jealousy is anger towards others. “How can that person live a life they can't do for themselves?” “Why can't I get ahead in my career, but that person can get ahead in my career?” and so on. Jealousy is not mainly about “things I can't do.” “What the other person is capable of” is the main thing. It's infuriating about “what the other person is capable of.”
Why do you feel angry when it's not about yourself? This is because there is an affliction, the “self-centered feeling (self-centered)” that we always have. “I want to be like this.” The thought “I wouldn't be able to stop feeling if I wasn't like this.” That's what it feels like. So, for example, isn't your child's successful experience something to be proud of as a parent? Never say, “I couldn't do it when I was a kid, so why can my own child do it?” I don't think any parents think that. It says, “If I'm not like this, I won't be able to stop feeling.” Probably because I don't have that feeling. On the other hand, how about a successful experience not of your own child, but of someone else's child? Maybe, “I can't have my own child, so why can that person's child do it?” That feeling of jealousy may arise. There it says, “I can't stop feeling my kids unless they're like this.” I think it's because I have that feeling.
In other words, even though we are talking about others, we are incorporating it into our self-centered thoughts. “Others are others, not ourselves.” “I can only cherish my way of life and my own life.” If you stand in that situation, you won't be jealous. However, this is not that easy to do. That's because our “self-centered feelings (selfishness)” are extremely deep-seated.
So what should we do? “I wouldn't be able to stop feeling like this. It was an egocentric feeling.” Being aware of this, and having someone who accepts such feelings of awareness, I think that by doing so, I can live a positive life while being jealous. And for me, it is Amida Nyorai (in my denomination) who accepts such feelings of awareness.
These are my answers. I hope it helps even a little bit.