Xavier didn't want to tell Elena the real reason Elleard marry her. One, she just went through a traumatic experience. She shouldn't hear any more devastating news in this state.
Also, Xavier might be right about Elleard seeing Elena as Lisa's replacement. However, it might not be the only reason. Xavier was not his brother, so he wouldn't know exactly what Elleard was thinking.
It was Elleard's business if he wanted to have that conversation with Elena or not.
"Tell me..." Elena looked at Xavier with her best puppy eyes and pouted her lips. Gosh... she looked so adorable that Xavier was tempted to pinch her cheeks and kissed those luscious lips. Elena asked, "If Elleard has ever loved a woman before. I want to know what she looked like, and what made Elleard love her."
"Why?" Xavier looked at Elena deeply, trying not to get lost in her beautiful eyes. "Do you want to find that woman and throw a fit? It's not a classy thing to do."