I want to text him?

I want to text my ex. But the thing is our relationship wasn't an actual relationship, I was just a bit confused what it was.

anyway it's been 5 months since we stopped talking and I realise I made a big mistake.

Is is it worth texting him, when he's kind of ignored two messages of mine.

I want to apologise and explain I've made a mistake. I just don't know what to do or how to continue. I'm thinking of writing down all I want to say and if he ignores it so be it but at least I told him. What do you guys think?
I want to text him?
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