Any advice?

Okay so my man has been acting kinda weird.. I had to use his phone to look up something for him and I saw he looked up how to cure love addiction and several other things about love addiction. I want to talk to him about it but I don't want him thinking I was violating his privacy on his phone. He's a super respectful guy and everything though so don't get me wrong. Anyways, the way he's been acting weird is that he hasn't been calling or texting me as much as he used to. Just a few days ago he was calling me several times a day while he was bored at work and we're adult plus very responsible so him doing that was always so sweet but he hasn't at all lately and then I pieced everything together and still don't know. He came in last night and said I was the love of his life and everything but idk he's still acting a little different and I can't really specify but it's worrying me. What is love addiction and do you think that's why he's acting weird? Like I'm so confused