暗恋你好久了可以用以下几种英文表达：
1. "I've been secretly in love with you for a long time."
2. "I've harbored a crush on you for quite some time now."
3. "You've been in my thoughts for a long period of time."
4. "I've been in love with you without you knowing it for ages."
5. "My feelings for you have been growing stronger over time, even though I haven't told you."
希望这些表达能帮助你传达你的情感。