In a way, yes. Though they never came out and said it, there was an understanding between Inuyasha and Kagome that they shared romantic feelings and were somewhat in a relationship. However, Inuyasha was unable to get over his feelings for Kikyo and would often disregard Kagome for her although he knew it pained her. So Inuyasha was, in a way, in two relationships, yet seemed to favor Kikyo, resulting in Kagome's jealousy. However she is able to overcome that bit of darkness in her heart and come to terms with the past Inuyasha and Kikyo shared.