I Had Been On And Off With My Boyfriend Since February Of 2022 It’s Now September

I had been on and off with my boyfriend since February of 2022 it’s now September.

He knows that’s I’ve cheated on him but this time something is different.

I’ve met someone who makes me laugh who I’m excited to talk to who understands me I’m falling in love with them.

Should I just leave my boyfriend without an explanation as to why or should I tell him so he knows we will never work in the near future and not to wait for me as he has been this past year.