How would you feel if your partner did this

I said I would think about TTC and said that sometimes we could not use anything but not all the time. Like if we remember to put a condom on the we would. My partner agreed as I said I didn't want to actively try to get pregnant. If it happens it happens kind of thing. But last night during the deed he was wearing a condom and during a change of position he removed the condom without telling me. The lied saying he thought it had snapped tho it hadn't I checked. How should I feel????