I think telling him in a non confronting way would be the best, maybe add a little humor to it. Thats one thing enfjs should be good at when it comes to intps
Plus he seems committed if you ask me, with the emailing twice a day, bringing you out to meet "special" friends, giving you gifts out of no where. Thats usually something that I really like doing, when a girl gives me that warm feeling thinking about her. Gifts in the sense of something I stumble upon that I know she really likes. The flowers and so on, is less likely. It might be insignificant gifts to most people, like a pen that has a good grip for writing and so on.
Maybe point out that eventhough you can see that he likes you, words means a lot more to you. The post about how an intp just need time to figure out and then will reach a point where it just comes out of the blue is something I agree on. Once committed Im pretty hard to get rid off in more than one way