Wrong Decision ......

So me & Sam have decided to give it another go, we both explained what we both want to change and to see how it goes until the 21st, two days later I've got the sentence 'Do you still want this' going through my head. So I'm thinking to my self Do i actually still want this, now because I'm an honest person when it comes to relationships, I told Sam what was going through my head, he said "who has put that in your head" or was it "whose been saying stuff". Well it was no one so I said that. So the last few days I've been trying to think if I want this or not, and Its like I might want it a bit, for Kiara and him, but things don't seem to feel right anymore, which upsets me inside to know that I don't want something like this. But I'm scared if I end this will my daughter lose her father and will I lose a Friend, Because Sam means a lot to me. there is love there its just like he said its the 'In Love' that's not there, as much as I want it to be. I have this horrible gut feelign of hurting him, that I really don't want to do, but I know I need to be happy. I seem to be picking argument with him to, which I think is a sign of me not wanting this. So now all I've got to do Is tell him.....
.... But how......