Dear Sad, if you do tell him---please, at least. do the following: (1) do it in a public place so he is less likely to throw a fit. (2) let others know-- that you trust can come to your aid quickly, if needed (3)keep well-charged phone at fingertips--to call 911, if necessary. (4) Arrange to have another adult in the house AFTER you tell him in the public place--for the first few nights--In case he decides to become revengeful (5) keep doors and windows locked at all times. (5) find out how to get emergency protective order in case you need it.
You can't predict how he will act. Keep yourself and little girl safe.
dandylion