Why doesn t he want to cry in front of me? Why did he say that?

My boyfriend and I have been together a few months and when he gets really stressed or frustrated around me, he doesn t try to show it. He tells me that it s because he doesn t want to look like a wimp. I know he s scared of losing me as much as I am losing him. We care about and are there for one another. The other day, we laid in bed and he said to me "you are locked up in my jail" when he put his arms and legs on me in cuddlin position. I find him somewhat controlling when we went out, only the other day though. All of a sudden he grabbed me and said mine, only mine, maybe cuz a group of guys was walking by. He was never this overprotective, jealous or controlling before. Is he becoming more insecure?