I don't know why

Its so hard to just walk away and never look back but its hard to not look back when he was the one that made me happy he made me smile when he held me he gave me butterfly's and my heart skipped a beat i want to tell him so he shall know before i go that he was my one only soul mater i want to tell him badly but i just can't tell him how madly i am in love with him but every time i try i get scared and hide