When someone isn't willing to make time and space for you in their life, it is usually because they don't respect how special of a person that you really are. They may genuinely like or love you, but we all must remember that showing love to someone is more than just telling them it every once a while.
Do not force yourself to have space in a person's life that DOESN'T recognize your worth. Instead use the time and energy that you want to dedicate to people of this nature in an effort to better yourself. Work on yourself and work on the other relationship that matter to you so you may easily become the best of you by the end of your lifetime.
Always respect those who have to be in your life but also recognize that those who see your potential are and those who are probably be of most help yet most love you during life's difficulties.
"For me let the past be past, I won't force myself to have space in that person life because if she/he know my worth, he/she will create one for me. Now what i'm doing is waiting for someone who is really cares and willing be my partner"