My boyfriend left

I'm not sure what to say besides I'm completely broken. I have sever mental health problems. My boyfriend & daughter are my world. I've been w him since I was 17 off & on. He got a job that he seemed to really love & he honestly seemed fine the past couple of days. Saturday me & my friend we're out all day getting stuff for Father's Day. We had planned a really great day for my boyfriend & Hers Sunday morning her boyfriend is supposed to leave well my boyfriend left with him. He just left his job his whole life to go on some weird money plot w my hg dude. He didn't give any explanation he really just left & when I told him wth we have so many plans today can u come back ? He straight up said no. It's been 3 days & I just break down all day I'm trying to be okay & figure out how to go on with my life but it's so hard. He was telling me how he is so excited for Sunday cause he's watching me put all this effort etc Saturday morning he was talking about he was getting a raise & a different position at work. Talking about getting married everything was so normal. So it's harder to process. I break down when looking in the fridge bc I had bought a cake for Father's Day. I break down looking in my closet where all of his gifts are at. I can't eat o can't sleep. To top it off my daughter is w my mother waiting for her covid results so everything is being torn up in my life. I've never felt this kind of pain in my life. I don't know what to do I just scream & cry all day.