Although I am not really an extrovert, I have always taken the position that being out there with how I feel about someone is the best policy. For example, I am in a sort of extended uncoupling process with someone I spent 14 years with and have a child with. She does not understand the concept that I will always love her. Black and white thinker. As far your situation goes, why try to lie to yourself or him? You don't have to overwhlem him with a tsunami of love proclamations, but you could still communicate the basics and get the job done. Then, see what happens.

I have been in your shoes twice. The first woman was very receptive, to my surprise, and we ended up being married for 17 years. She turned out to be a bit**. Oh well. I tried. The second woman was actually pissed at me, seriously pissed, for me sharing that I was fairly certain I loved her. She was a work colleague from another country. Long story. Anyhow, we wound up together for some extended period of time, but the 8000 mile distance was hard, ultimately. In any case, very glad I told from my heart and have no regrets.

So, I say, speak your truth and be at peace.