My boyfriend didn’t stop when I used the safe word?

My boyfriend and I decided to try using a rope, gag, and a whip for fun. We agreed the safe word would be when I held up two fingers. I didn’t think the whip would hurt a lot but after a while he started being rough so I held up two fingers and he tells me to hold on because he’s close. So I wait a little while and he uses the whip again. I held two fingers up and he tells me he can’t stop because it feels too good and he’s really close. I started to panic because not only the whip hurt, he was thrusting too hard and I was sore. He finally finished and told me he was sorry but my struggling really turned him on then he untied me. I cried and didn’t say a word to him. He apologized a lot but I don’t trust him anymore. Is it really that hard for a guy to stop when they’re turned on?
My boyfriend didn’t stop when I used the safe word?
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