I am a master student and an intern in a company. I have joined a company 11 months ago. After completing my first project (after about 6 months) which was a successful project, the company became interested and wanted to hire another student as well. He is my fellow worker.
I clearly remember that when he joined the company, he was literally trying to fight me, trying to correct me, still has that behavior. But I have never told anyone about that. At that moment I told myself how dare he is? He is new and fighting someone that is already here. Anyways that was weird for me to see something like that.
I usually keep things inside me and never tell anyone, I did the same thing and never talked to anyone in the company about how he is behaving.
However, now I am feeling more pressure as his behaviors got even worse. He really annoys me by following behaviors:
In our group meeting (for our work updates), he asks me questions in a really rude way, in a way that he thinks that he wants to correct me.
He thinks that he knows my work more than I do. The way he talks implies that he wants to rule or be my manager.
He jumps into my talk and takes my ideas and by a bite modification, he presents it to the company as his ideas.
He is very jealous and tries to take over my tasks, he literally told me that he wants to do my task.
Considering all these what would be the professional way to handle this?