Urgent: How can I inform a friend in denial that his relationship is toxic?

Tara016
Hello,
My long distance best friend has a girlfriend who's toxic. She's his childhood friend so he's scared to leave her and never have a partner again so be alone for life. He's very sensitive and emotional.

He once told me she didn't want to make an effort to meet him after the pandemic, gave excuses to meet after he paid for a PCR test and got negative because she said she feared he might be infected so meeting wasn't possible, and recently, she asked for his opinion on a certain matter.
He gave her his opinion. She got mad at him because his opinion didn't agree with hers.
I told him it wasn't fair and he expressed how hurt he was from such things and stressed too. His chest hurts when he's stressed and lately he's in a lot of pain.
I told him this was toxic and he needed to talk it out with her. He seemed hesitant and wanted to postpone the time he talked with her about how he feels in these matters. He said that since it would be their first reunion after a year and a few months from covid, he didn't want to "ruin the mood".
I told him: ruin the mood by expressing your hurt feelings to your partner? Shouldn't that be no problem?
by the way, he's going through therapy sessions to "fix their relationship" because she tells him it's his fault. No compromise.
Then he said he's planning to marry her.
I snapped. I don't want him to live an unhappy marriage, he's already insecure and she seems so controlling. His mother told him the same I did!
He bought a ring but didn't ask yet because he wants to talk with her and judge from that.

I was so upset I told him I'd respect any decision he takes but if he chooses to stay with her, it would be best to cut contact which was a knife to my heart (and to his too).
Yet, it's for the best.
He will keep me updated but knowing him, I know it'll be her he chooses.
Is there a way I can ensure he doesn't ruin his whole life with that woman? I'm so worried. I'm only behind a screen so... Any advice is highly appreciated.
Urgent: How can I inform a friend in denial that his relationship is toxic?
Urgent: How can I inform a friend in denial that his relationship is toxic?
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