What's that

A guy named Zenith goes to the same place you go learn a subject. He is that kind of guy who never notices any girl going there. Even if you and zenith studying together for an hour or two he will never look at you.
            One fine day he suddenly looked at Tessa and remained looking for a minute, he was starring, though zenith was studying with Tessa for two months. Tessa could feel that zenith was staring at her face for a minute, Tessa ignored it. After a sudden Rem jumped in excitement and told Tessa have u noticed Zenith staring at u. Tessa he was may be thinking of something and though I was sitting opposite to him he looked at my face. That Zenith's eyes contacted Tessa's for 5 times. When Tessa was leaving the place she found Zenith can stop his from looking at hers she looked and looked at Rem again she looked again it was the same.
                              Next day Tessa had to sit beside Zenith as Rem was absent. Tessa started blushing, she could feel her cheeks becoming red, she could feel the burning sensation within her cheeks and goosebumps on her whole body when Zeniths hand got a by chance touch while exchanging the copy.
       Third day when Zenith was sitting he gave a melting look to Tessa and both their eyes connected for few seconds. Zenith secretly looks at Tessa and when he found Rem is looking he immediately put his head down straight to the copy. Rem always finds Zenith looking at Tessa from any of the hiding ways it can. Tessa is also getting a close feeling towards zenith. 
      These three days in the two months is really confusing in the life of Tessa
                       What's going on. Actually my mind is asking what's that