ARIANA GRANDE & PETE DAVIDSON SPLIT, ENGAGEMENT CALLED OFF - MAC MILLER'S DEATH WAS BREAKING

Ariana Grande and Pete Davidson hit a life-changing phase in their relationship last month when Mac Miller died.

According to TMZ Mac Miller's death was the tipping point that led to their split.

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Sources close to Ariana and Pete told TMZ that, ... Ariana was in an incredibly dark place following her ex-boyfriend's apparent fatal overdose. She didn't blame herself -- she feels she did everything she could to get him sober -- but it left her an emotional wreck.

In the aftermath of Mac's death, TMZ sources say Ariana realized a couple of things -- she couldn't be fully invested in her relationship with Pete, and she had rushed into a looming marriage way too fast by getting engaged.

TMZ reported that, ... Ariana and Pete broke things off this weekend and called off their engagement. The decision was mutual, but Ariana was the one who pulled the trigger.

TMZ reports that, Ariana never signaled things were bad. In fact ... Ariana was at 'SNL' Saturday supporting Pete and nothing seemed amiss. Folks who were there say they looked all boo'd up, kissing and holding each other backstage. Something clearly snapped Sunday.

Ariana and Pete are yet to comment on the breakup.

My view: If you love someone and the person has psychological and drug problem, always get intouch daily to see how they are doing, even if you're no longer together, just show you care about their health, not to flaunt your new relationship across the media to make the person feel bad, then when bad things happens you begin to regret. It's so sad, medicine after death don't work.