I miss my ex but its not that bad

Ok so me and my ex girlfriend broke up a few months ago. I told her that i lost feelings for her but i really didnt. I really needed a break for my mental health and i know she needed it too. I tried to tell her before that i needed a break but she never really gave it to me. She used me to vent multiple times a day even though she knew i was going theough some things too. Recently she got the help that she really needed and shes a better person now. I didnt really miss her until recently i really admitted it to myself. We were so in love and we really understood each other. I feel like she was the right person wrong time. I dont know what to do because i cant just tell her how i feel because im talking to someone else. Help.