miss him or the relationship...???

After listening to "kau pergi" song by Aizat, i have just realized that i really missed someone..my Ex actually...huhu...don't know y..??do i really missed him or just our relationship..i don't know...it's quite hard for me about letting him go because he ended up our relationship just like that...SUDDENLY..without any warning or any signal...just like that.. *sigh* i know that he is now with his Ex...LIVING HAPPILY EVER AFTER...~ ~ ~ but,i still want to know why did he ended up our relationship...i always got curious when someone with unfamiliar phone no. text me...i always thought that "they" was him...huhuhuhu...sound crazy right...