I did reject someone

I have only rejected 4 person in my entire life. First one is just not really my type and I like someone already. Second was he was too short for me (i like tall guys) and not really my type. Third one, he was honestly a good guy but after just 1 week of thinking if i can like him, i realized that i can't like him and fallen for someone else again. And The Last is I didn't reject him at first. I tried to like h and i did. I really did. It's just that my heart at that time wasn't ready. I just broke up with my ex that time. My ex was my 4 year one sided crush. So it was for me and the fourth guy really conforted me. He was ready to accept me. But i said that he can comeback after im fully healed. But just after a month, i came back with my ex (broke up with hime again after 2 months. And now imy happily single. It was really hard to reject someone especially they are really a good guy.