After several honest conversations, they finally rekindled their friendship.

rekindled 是动词 rekindle 的过去式。rekindle 由前缀 re-（表示"重新"）和动词 kindle（点燃、激起）组成，字面意思是"重新点燃"，引申为"重新建立、重燃"某种关系或情感。