Why Do I Keep Dreaming These Negative Dreams About My Boyfriend?

I’ve had multiple negative dreams about my Boyfriend lately.
I had a dream that I went on a long trip and when I came home to my boyfriend, he couldn’t see or hear me. I tried waving my arms in front of him, screaming, throwing things. Any that I could do to get his attention. Eventually another girl came in, one he could see and hear. She hugged him and he started crying about how much he missed me. The girl then, looked right at me, and grin with an evil smirk on her face, like she knew I was there and had something to do with the fact that my boyfriend couldn’t see me.
I had another dream that he died and I had to plan his funeral. Everyone was crying and really upset. I had this horrible feeling that I was partially responsible.
I’ve had many other dreams that involve my boyfriend and something negative. In real life though, he’s super sweet and caring and seems to be genuinely committed to me. Any idea on what it all means?