How to make her realize my love and get her love same as in the past?

When you're engaged to her & waiting for marriage, you must wait as you're not going to lose her. Do not be over emotional. Blackmailing issues may not be serious ones , otherwise, you would have broken all contacts. Principlally, it is not advisable to contact fiance before wedding. Let her take the initiative for briefly contacting you. Love & affection, you should show at 'first night' after wedding. Reserve that till that time to come.