Natalia, а разве не WHO will love you?

Елена, не обязательно.

In defining relative clauses we often use that instead of who, whom or which. This is very common in informal speaking:

They’re the people that want to buy our house.

Here are some cells that have been affected.

http://dictionary.cambridge.org/ru/%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%B1%D1%80%D0%B8%D1%82%D0%B0%D0%BD%D1%81%D0%BA%D0%B0%D1%8F-%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/relative-clauses-defining-and-non-defining

Who (а не that) обязательно только в non-defining relative clauses.

Спасибо, Галина!