Next time there is a review of your work, you tell them that you deserve a good raise for all the work you did, specifying exactly those areas. Your boss will be surprised because that colleague claimed it was his work. Now you act all surprised, because that is total need to you, and you tell your boss that your colleague would have had no idea how to do this.

Now you are not a jealous colleague, you are someone who has done a good job and robbed of the rewards.

Next time there is a review of your work, you tell them that you deserve a good raise for all the work you did, specifying exactly those areas. Your boss will be surprised because that colleague claimed it was his work. Now you act all surprised, because that is total news to you, and you tell your boss that your colleague would have had no idea how to do this.

Now you are not a jealous colleague, you are someone who has done a good job and robbed of the rewards.