He really loves her. And want that she chose him for future life.

"Thank you very much dear Liubov.
I believe, for example, that Lina must marry that poor boy because she will have to make mistakes and grow up after having overcome important sufferings. She thinks she can have it all because she’s a little prettier than other women. But this is not enough to be happy and have a good future and a solid life. Life is often bad, very often unpredictable. Those who hang from a silk thread fall and get very hurt. At 99.99% Lina will marry that poor man and at 99.99% she and I will never be together. 101% she will part with this man. If, as is likely, she will have children with him, she will have a life full of trouble, sadness, regret. Regrets are hard to remove. But it’s okay to let people choose their destiny. You’re not going anywhere. You cannot become rich and in Europe without money you live very badly and above all with too much uncertainty and always on the margins of society.
You’ll see I’m not wrong.
If she had been smarter, she’d already be here and be a lady just next to me.
If she doesn’t understand how much she’s losing and what she can never have, you’re not responsible for her failure."