Afraid of molester....what do i do?

18 years ago i was molested over a period of 2 years by my aunts husband, i told my cousin what her father was doing to me and she asked me to swear not to tell. I was afraid and scared so i kept my abuse a secret from the rest of family. I just had a discussion with my cousin and asked her why she made me swear not to tell and she said she didn't want to lose her father. I'm now feeling confused and hurt, i'm angry at myself because now when i look back at it, i regret not telling...My aunt and her husband is now in the us and invited me to their house, i have been avoiding going there and my cousin says i should just get over it because it was 18 years ago. Should i tell my aunt the real reason i don't want to visit or should i just let sleeping dogs lie?