You're My Everything (Millennial Mail-Order Bride Romance #5)
Zoe Matthews

He finds a incredibly driven woman who always fights for what she wants and needs. He learns that she is compassionately raising her two half siblings after the death of their mother. When he learns about some of the problems in her life, he surprises himself and he offers to help her. He knows he can never let himself love another woman: his ex fiance has ruined his trust of other people so thoroughly that there was no letting his walls down again. Regardless of this, his desire to help Haven is impossible to resist, and he offers to marry her to help her continue to be the guardian of her two sisters.
Haven understands he will never be able to truly love her or let her into his life, but she needs his help. She accepts his offer of marriage, and finds herself incredibly attracted to this man. Will Alex be able to let himself open up to Haven, and will she have the patience to wait that long?