Why is he suddenly protective towards me?

Anonymous
This guy I been dating has been very protective over me lately. He watches over me , I slept over his house and he thought he heard something in the middle of the night so he told me to stay in the room and not come out that he was guna go see, also he gave me advice the other day he said I'm too gullible that I need to look out that people lie I can't trust everyone , also we us to always go on 'adventures' when we berly started dating checking out old run down houses and the other I told him to meet me at one of the houses and he told me okay but not to go inside because I never know who could be in there. And like before he wouldn't mind me going alone to a house. Like does he think I'm weak since he's getting to know me better? I mean I don't want to make it seem like I depend on him or that I'm a weight on him he needs to protect.
Why is he suddenly protective towards me?
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