Have you ever had to take back 'I love you'?

I care a lot about my boyfriend, but I feel like I was pressured into saying “I love you.” I now realize that I really am not in love. This is the second time this has happened to me. I don’t seem to learn. I say “I love you” because the guy says it first, and I feel guilty for not reciprocating. I don’t want to hurt him, so I say it. And then I convince myself that I actually am in love, for a short while. I feel like this relationship isn’t going anywhere, he makes me feel like a bad person, and I’m just not happy. But I really don’t think I can bear to break up with him, or at least take back what I said. Part of me really wants to stay, but part of me knows this isn’t what I’m looking for. I don’t want him to think I don’t care, but I feel like I’m lying if I continue to say “I love you.” What should I do?