Just ended an 18 month relationship as it wasn’t going anywhere.
He couldn’t commit to anything more than regular sex. So we were, really, more like FWB.
Before we started sleeping together we had been good friends. But, surprise surprise, as soon as we started having sex, he treated me the worst he’s ever done in our entire 20 year friendship. 
So after yet another argument over him not giving a damn about my well being (this time it was over a recent health scare I’ve had, when he didn’t even bother to ask how it went at hospital) I decided the friendship was over.
I sent him a courtesy text letting him know that I was unhappy with his treatment of me and our friendship (the third time I have raised it in the last six months) and that I wished him well but wanted to cease contact. Then I blocked and deleted his number.
Was that too harsh? Should I have waited for him to respond?