Should I text my ex this?

My ex and I have been broke up for about 3 weeks now. It was a 4 month relationship with a lot of lying and broken promises on his side. He had multiple women friends and would even message his ex for advice on us... all thing’s I didn’t like that made me sad and uncomfortable. We needed on very bad terms and I do for some reason feel bad for it. Should I text him and tell him I don’t hate him or dis like... that I am sorry it did not work out for us? I don’t want him thinking that I hate him or anything.
Should I text my ex this?
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