Sex no longer feels like “making love”

My partner and I have been together for awhile. He’s the first person I’ve slept with where I could tell the difference between just sex, and making love. Recently, I found out information that seems false, but I feel like it still got to my head. (It doesn’t deal with him cheating on me) Ever since I found this information out, I haven’t wanted to have sex with him and when we do have sex, it feels like just sex again and I don’t know what to do. He’s someone I can actually see myself marrying and having kids with. And I don’t want to let something like this come in between us, but I don’t know what to do. And I know he’s noticed the distance between us when it comes to being intimate with each other.