This guy and I have dated off and on for three years and broken up many times..?

It depends how you feel about him, do you want him back into your life and if so in what way. If you are hoping to have a relationship with him again then you try talking to him but if you haven't done anything wrong don't apologise over nothings. If you are not interested in him, wait and see if he wants to talk to you, as by going to talk to him first you could be giving him further hope. Just take time to decide what you want to do before talking to him and I think a good piece of advice I got told is you will hurt them less if you say no now rather then going out with them for a while then going actually I didn't really want this in the first place... Hope this is a tiny bit of help