Whatever you do, be honest and kind when you speak to him. I think you have already expressed the unhappy things that have lead to your decision, so keep it simple, straightforward and factual. A reality of life is that love isn't enough for a relationship to function.

You have both been hurt by the other. You both have the right to your feelings. If emotions run a little high and stressed in the next 2 weeks, step back, make eye contact and say I want to not argue with you. It's clear we have things to discuss. Now is not the time to discuss them.

It's OK to table an emotionally charged conversation until feelings are under control. Keep yourself safe and leave if you are in danger.

Good luck.