Lily had been with Dimitri's dragon and that was a wild night full of intense feeling and rough riding. Dragons are very possessive of their mate's and claim them so thoroughly that the thought of looking at another would deter them. Lily never thought her feelings would be for more then one person. Since she could understand the words of the people around her love and having a mate bond meant holding to that.
Living in that Palace in the Wolf Clan taught her that love is precious and should never be taken lightly. With all the intrigue and back stabbing happening Lily wanted someone who loves her and only her. Love attaches you to someone in such a way that no matter what your feeling are, you still find yourself wanting to know how the other is feeling to make sure the other is okay. Just the sound of their voice settles the nerves or the rumble of their chest sets a fire racing over the body.