He was in a relationship and his female companion decided to confess her feelings for him. She made him feel awkward putting him in a situation he wanted but not at the current moment. He had feelings for her but he would remain loyal to his gf.
Why did they admit; how they felt, after he messed up, but he never knew he had a chance with her. He was a good friend didn't let his feelings get the best of him. He never acted on those emotions because he didn't like feeling vunerable or being used most of all being taken for granted.