Husband constantly going through my things

So my husband is constantly going through my belongings..my purse, bags, car, etc. He also always tries to go through my phone, usually when he thinks I'm asleep.

I've never done anything to warrant this and it's getting really strange and annoying.

He also constantly banters with me about having boyfriends, etc and then plays it off as a joke.

If I question it He says I'm being suspicious and defensive. Why would he be doing this and how can I make it stop?..