Looking for advice on talking to that friend (25) who has entered

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Looking for advice on talking to that friend (25) who has entered a relationship who is slightly older (28?)
He has always been known as good looking but lacked interpersonal skill. This is basically his first real relationship ever, only losing his virginity a few months beforehand.
She is a recent divorcee (they had to wait til after they were legally split to get together) out of an abusive relationship.
Originially was happy because he was happy, however, he has become more and more absent in general. In fact there was a scenario where his phone was called by a mutual friend and she picked up, saying that he had "lost phone privileges." He's just a regular ass guy who works a lot and when he's not, he watches anime. Anything he had done to upset the female had to be minor.
they've been together for several months, and she just removes every ounce of personality, fun, and manhood he seems to have.
I think it's obvious how I feel about the relationship, I just wonder how I can approach a 25-26 year old who might as well be in their first real relationship ever.