I have a huawei and I can use finger print sensor to keep apps locked and also use a dual profile so one i can show people my phone with and the other for me to use.. I am not sure if thats an android feature or just on huawei.
that aside his lack of trust is just not right
Just figure out what app he's using to spy on you with and uninstall it. If he doesn't like that, it may be time to forget "but hes my husband" and start remembering "but I'm not safe with someone like that".