I think it’s called cold feet. Everything you mentioned seems normal, and he sounds like a great, hard to find guy.
The only possible red flag is the “at times not attracted to him” part. Are you then turned off from him, or merely not going crazy about him?
In life in general, are you generally bubbly about stuff or more placid and perhaps cautious? Your personality and reaction to gifts for example, will not mirror those of your friend but will always remain you, albeit somewhat magnified because this is MAJOR. And if your moods normally fluctuate (and whose don’t) you can’t expect to always feel “romantic” to his gestures.