Don’t know what advice to give my friend... Please help.

I’ve known my best friend for about four years.

In March, he started dating a girl and fell in love. They’ve said I love you, and had a pretty good relationship until now.

Her best friend is a guy that she will constantly cuddle with and make jokes about being more manly than my friend. He got very jealous of this. The other day he was very upset about something and asked her for attention, and she ignored him and cuddled with her friend which made him very jealous.

He confronted her about this, and she got defensive.

Now she’s saying she wants “a break” to spend more time with herself.

i don’t know what advice to give him. He seems convinced that it’s just a break, but I don’t know... I feel like breaks typically lead to break ups. But I don’t want to discourage him from a potentially fixable relationship.