Mitali really doesn't have an intention of walking away. For her, just as long as neil keeps saying to her that he wants to move on etc and doesn't say no outright to her face, irregardless of whether his actions and eyes make it clear he still loves avni, she will continue to stick to neil like glue and not leave. She will continue pacifying her heart with neil's half-assed consent, because this girl is so desperate that she is more than ready to throw her self-respect out of the window just as long as neil continues to pacify her. She'll ignore all the obvious signs in favour of neil's fake words of assurance, because she so desperately wants to marry him that she can easily ignore all the signs. Now she can't just blame neil, because she is equally to blame in this.