Most Helpful Guy
Oh honey this is really unfortunate. Firstly, I'm going to be blunt and say you shouldn't have let it transition into dating from friends unless you were 100% confident it would last. I know it takes two to tango but at least admit for your part in it.
For the question, if you're unsure about a relationship, talk to him first. But if you're unhappy, then you'll have to end it to avoid longterm heartbreak. (Summary: unsure = communicate; unhappy = end it). And ultimately, I do agree with what's already been said, you will find it difficult to go back go friends after dating. As you will be the one to end it, he will harbour the feeling he has for you. They will ferment and grow stronger (after all, you don't know what you have until it's gone). Although if you are able to end it on good terms and have a mutual understanding of the boundaries of your then-adjusted relationship then you could make it work as friends. But is his company worth being unsure/unhappy about?
Hope this helps!!
- Dr Chance