My partner has changed?

Over the last few months my partner turns his phone away from me when he's it, won't check notification or even open the screen when I'm in eye shot, has put a lot of new security on it, has downloaded a lot of chat apps, stopped sleeping with me and is very distant.

I've tried talking to him about what's going on but he just turned it on me and says I'm overreacting.. he's aloud to keep things private. He just gets mad at me for bring the subject up. He always ends it with ' I wouldn't be with you if I didn't love you '

But I've still got this feeling something is going on. Need advice please
My partner has changed?
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