Looking on the internet deeply has found these results:

losing interest to is the most popular phrase on the web.

losing interest into 14,930 results on the web	losing interest to 148,400 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
She's worried that you're losing interest in being a dad. I'll tell you when I noticed that GM was losing interest... But I do sort of get why Lacey's losing interest in him. We are losing interest in the past more rapidly. All right, losing interest now. I'd say she was worried her husband might be losing interest in her. I'm losing interest in this game. I think he's losing interest in me.	The question of whether jealousy is the fear of sharing or the fear of losing was of little interest to me. We are losing interest in the past more rapidly. I'd say she was worried her husband might be losing interest in her. I'm losing interest in this game. I'll tell you when I noticed that GM was losing interest... I think he's losing interest in me. All right, losing interest now. She's worried that you're losing interest in being a dad.

losing interest into

14,930 results on the web

losing interest to

148,400 results on the web

More popular!

The question of whether jealousy is the fear of sharing or the fear of losing was of little interest to me.
We are losing interest in the past more rapidly.
I'd say she was worried her husband might be losing interest in her.
I'm losing interest in this game.
I'll tell you when I noticed that GM was losing interest...
I think he's losing interest in me.
All right, losing interest now.
She's worried that you're losing interest in being a dad.