Little 'L'

Well, things are going well on the relationship front. We've spent loads of time together, and are getting on great. However, last night things shot up to super-turbo speed... We were sat on the sofa, watching tele, as we have done numerous times before. He turned round to kiss me, and told me he had fallen completely in love with me... Yep, you read right. Not even a 'I think I am...'. I didn't know what to say... I was flattered, obvously. But I couldn't say it back to him. We've only been together a few weeks - not even a month yet. It's just too soon. Plus the last person I was in love with was D, and he broke my heart. So I didn't say anything.
After about 20 minutes, he told me again, as though I didn't believe him the first time. I still didn't know what to say. I told him we'd not been together that long, and he replied that he knew that it was a bit fast (understatement me thinks...), but he felt so strong about this.
So now I don't know what to do... To be honest I've seen this coming for the past couple of weeks, as he's told me a few times that he's never felt this way about anyone before. The problem is, that he's been married before - after proposing to her just 3 months into their relationship. He says himself it was too much too fast, but still... after just 3 weeks he's telling me he loves me. And there's Xmas coming up... Maybe I should have a word with his brother, try and hint at any kind of ring as a gift would not be a good idea... I don't even know that he would tbh, but it's a scary thought. Yeah, I do like him alot. And the more time we spend together, the more I like him, and the more I want to be with him. But this is going a bit fast for my liking. I don't want him to think that because I'm not saying I love him back, that I don't want to be with him, cos that's certainly not the case. I just wish he'd slow down a bit...