He has a lot of problems and feels jealous of others

Firstly: 

We are happy to find among
Muslims such excellent awareness of their psychological or mental problems.
You have done well not to blame these problems on the jinn, because many
people go to extremes in that, and every time something happens to one of
them he says that it is because of the jinn, even though Allah, may He be
glorified and exalted, has set boundaries for their realm which cannot be
crossed except if Allah wills, and He has appointed for people guardians
from among the angels who protect them from evil. Allah, may He be glorified
and exalted, says (interpretation of the meaning):

For each one
are successive [angels] before and behind him who protect him by the decree
of Allah. (ar-Ra‘d 13:11) 

Al-Hafiz Ibn Katheer (may Allah
have mercy on him) said: 

That is, each person has angels
who come to him in succession, guarding him by night and by day, protecting
him against bad things and accidents, just as other angels come to him in
succession to record his deeds, both good and bad, angels who come by night
and by day. So there are two angels on the right and left who record his
deeds, and two other angels who protect him and guard him, one behind him
and another in front of him. So he is surrounded by four angels by day and
four others by night, two guarding him and two recording his deeds.End quote from
Tafseer al-Quran and ‘Azeem (4/437) 

The Prophet (blessings and peace
of Allah be upon him) said to his paternal cousin ‘Abdullah ibn ‘Abbas (may
Allah be pleased with him): “Be mindful of Allah, and He will protect you.”
Narrated by al-Bukhari (2516) 

So it is not permissible for
anyone to blame the jinn for everything that happens to him, so as to make
himself free of error or shortcoming, for Allah, may He be exalted, has told
us that everything that befalls the individual is because of his own sins
and disobedience towards Allah. Good and bad alike are decreed by Allah, may
He be exalted, but Allah has decreed it and has decreed its causes along
with it, such as obedience or disobedience to Him. Allah, may He be exalted,
says (interpretation of the meaning):

And whatever
strikes you of disaster – it is for what your hands have earned; but He
pardons much. (ash-Shoora 42:30)

Corruption has appeared throughout the land and sea
by [reason of] what the hands of people have earned so He may let them taste
part of [the consequence of] what they have done that perhaps they will
return [to righteousness]. (ar-Room 30:41).

This has to do with bad things
and misfortune. 

With regard to good things and
happiness, Allah, may He be exalted, says (interpretation of the meaning):

Whoever does
righteousness, whether male or female, while he is a believer – We will
surely cause him to live a good life, and We will surely give them their
reward [in the Hereafter] according to the best of what they used to do.
(an-Nahl 16:97)

{And
whoever fears Allah – He will make for him a way out

And will
provide for him from where he does not expect. And whoever relies upon Allah
– then He is sufficient for him. Indeed, Allah will accomplish His purpose.
Allah has already set for everything a [decreed] extent.}
[al-Talaq
65:2-3].

 So whoever wants a happy,
tranquil, good life, and wants things to be made easy for him and to get out
of every crisis and problem that he is faced with, has to believe, do
righteous deeds and fear Allah. Otherwise, he will never find happiness or
peace of mind. 

But whoever indulges in
disobedience to Allah and going against His commands has chosen misery for
himself, and if anything happens to him after that, he has no one to blame
but himself. 

It is not wise to fall short in
taking measures that will lead to happiness, then spend your time lamenting
your situation and the misery you are going through. 

You have to mend your
relationship with Allah, may He be exalted, first of all. Then after that,
Allah will set straight all your affairs. 

On our website we have presented
a number of ideas and suggestions that will help to build confidence and
overcome difficulties and crises. Please see no.

83962,

113465,

194318 and

212179. 

We have also mentioned some
advice for healing from the disease of envy in the heart. Please see the
answer to question no.

12205. We ask
Allah, may He be exalted, to set your affairs straight and to enable you to
do that which He loves and is pleased with. 

And Allah knows best.