Is it better to tell someone exactly what I think of them or detach and ignore?

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I am extremely angry at how I have been treated by 2 people recently , they don't know how I feel and to be honest I am ok with not having them in my life anymore. I've known them both for about a year, one is a friend and the other is someone I was seeing casually, they don't know each other.
But their behavior for different reasons has really annoyed me, they have texted me as if all is ok in the last week and I haven't replied. I should also add that they can be quick tempered and have issues and would probably deflect everything back to me and gaslight me.
So do I sit in my anger, breathe and just totally detach from them and not respond to them ever, cutting them out of my life. If so, what do I do with my anger?
Or should I satisfy my anger and text them exactly what I think of them, it would probably make me feel better.
I am more annoyed at the guy I was seeing and would love to tell him what a nasty piece of work he is etc but I know he would be horrible back and block me. What to do?

I would go with something bland to be honest.

Text the guy, 'hey, this just isn't working any longer for me - all the best for the future' and then block.

Friend of a year? I'd probably just ghost. I can't be bothered with the drama. Silence says it all.

Also, vague indifference and disinterest is far more insulting to him/them than outraged anger. Don't let them know you give a shit.

I've found myself in this situation recently and I decided there was no point in saying anything because it wouldn't change anything. Their behaviour wouldn't change and it would just end up in drama.
I only get into these conversations if I think the relationship is worthwhile xx

I think with the guy you were seeing you should leave well enough alone. As you say, he's likely to respond angrily, probably make you doubt yourself and make you feel worse, then block you to make sure he got the last word.

With the friend, if you think they will react the same way I'd be tempted also to block, it depends how close you were as friends.

Definitely write both of them an 'anger letter' - get it all out on paper (or if digitally definitely not in your email app, I'm sure there was a thread on Mumsnet recently where the person accidentally pressed send). But then burn it/delete it and move on. Some info about anger letters here.

@Hatty65 that's exactly what I want to do, I would love to come across really indifferent and not bothered to the guy. If I send an emotional response he will just know that he's got to me. I haven't replied to his last message which at least shows that I'm no longer interested in him

But what have these people done to annoy you so much?

@IntheVicinity I don't think it really matters what they've done, it was enough to anger and upset me so my feelings are valid

This is the best way forward.

Play it very very cool and if you feel you have to reply if he keeps asking, just say that your feelings have changed and you think it's best to move on.

With the friend, it's probably easiest to drift apart but if she is very dramatic I find saying something very honest and very calm is the best way of not letting things drag on. 'I was really hurt when X happened and it has changed how I see our friendship.'

I'm a big fan of "detach and ignore." These confrontations never go the way you hope they will. Chances are they don't listen to what you say and just go on the attack themselves in retaliation, and then you end up feeling worse than you did before.

Just dropping someone is more effective, in my book. It's like "you're not worth my time," rather than "you're important to my feelings and I give you lots of headspace." Which would you rather project?

@Habbit exactly, it's different if they are someone I have to see again but I won't ever have to see either of them again if I decide to drop them. They have shown themselves to be volatile before so I know they will retaliate and won't take accountability rather than admit to doing something wrong.
I would rather project that I no longer care and that I am unaffected by them so the best way to do that is to disengage and hope they take the hint and leave me alone.

I would write them a letter explaining why I was so angry at what they had done, and how it affected me. Then I would burn it. I wouldn't contact them, or give them any headspace; team detach and ignore.