I have just clicked the my picture with him to inform you that he is a unique and different user who uses his own account.

Check the time of the picture clicked. The date shows everything clearly.

There are some haters and people who cannot see others progressing and they always try to pull them back.

If someone uses my register then does that mean I am using account of that person?

If you keenly check the writing style, image uploading style, start and end of the post is complete different according to his writing style.

I hope it will clear the doubts.