如何用英语拒绝别人的表白，但又不想破坏感情

Well,I am flattered by your attentionBut honestly,I don't think now is the right time for us to go into a deep relationshipBesides,I am not as nice as you think I amYou'll probably be bored with me once you get to know meAnyway,we are still friends,aren't we

首先感谢别人对你的真心，但是拒绝。一个理由是现在的时机不太适合谈恋爱。其次，自己也没表面上那么好（自我贬低可以让对方心里好受些）。但最后一定还是朋友（不要义正言辞地一口回绝，连朋友都没得做）。