I'm suggesting you make the effort to explain why you did what you did, to apologise, make a vague throwaway "let's stay friends" remark and leave it at that. You shouldn't have send him those messages... explaining why will help make you seem like a more normal person, and saying, let's stay friends after the dust settles, proves that you're getting over him. Otherwise you wouldn't suggest such a thing.
My advice is to make that effort, be the biggger person, and then cease communication with him permanently if you really can't cope with staying friends.