I feel for you. No contact will not help in getting him back or to make him miss you. He might miss you when you exercise no contact but his feelings for you won't change. He won't come back to you.
I pray you forget him. Don't hurt yourself anymore. You need to forget him. It's a sad thing to love someone but that person has mixed feelings for you.
Your ex's feelings for you are not constant. You have been hurting for six months. You need to rearrange your life by deciding to stop chasing after him.
A relationship is a two-way traffic or communication. You can't say in a relationship with someone who loves you one day and the next day he no longer has feelings for you. You can't stay in a relationship where you love the person but the person's feelings for you changes and wants a breakup.
I feel for you. I feel sad for you because you love the person too much but the person doesn't love you in such a manner. His love for you fluctuates. It's not constant.
Please, move on. Don't waste your precious time (life) trying to live with a person whose love for you is unpredictable. Life is short. Forget him and move on with your life.