Boyfriend’s dog died my fault how to help be there?

My dog ran down street so I packed my daughters up in car to chase her down, and my boyfriend’s dog got out without me knowing. She’s a yorkie so don’t know if she snuck past me she usually never did that. When I came home I couldn’t find her but found her outside under the trailer. So much blood barely moving. I had to pack my babies up again which wasted more time she died on the way to vet. I know it’s my fault I should have be more careful I don’t think I hit her but maybe someone else did or a dog got her I don't know. I’m not sure how to help my boyfriend I feel terrible…like it’s all my fault and I never should have left. I don’t know if he’ll forgive me…what could I do to help or show him I’m so very sorry and didn’t mean for anything to happen

Boyfriend’s dog died my fault how to help be there?
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