The personal and professional risks are too great for you to form any kind of romantic liaison with a student. The real problem with relationships between teachers and students is the unfavorable situation it creates for other students who don't have influence with the instructor due to romantic attachments. Furthermore, because of the power you have over students as a TA, dating situations with students can lead to accusations or instances of sexual harassment. It also puts stress on both. Slow and fast learners .
Students have quite a variety of educational backgrounds, motivations, goals, interests, etc.
One challenging aspect of teaching is fulfilling the needs of all your students simultaneously. Sometimes you may be compelled to direct more of your effort toward better students at the expense of poor students, or vice versa. Ideally, you will direct the necessary effort toward all your students so they all learn the subject material equally well. A good approach is to determine your goals and expectations for students in advance and teach toward those, making adjustments in response to the class as a whole, not in response to the needs of a few good or poor students. Encourage good students and assist poor students, but not to excess.