I wanted my current boyfriend to get into MBTI but he said he rather not, as you start subconsciously basing everything you do on 4 letters. He was right.
He actually began to tell me, "Idk about this MBTI, but you are acting quite odd nowadays." I was, and I think it's because I was way more in my head trying to make a connection between my behaviors and said traits I was suppose to have.
My experience with MBTI has been more disappointing than anything. And it's because I wanted to find a niche where I felt I at last fit into, but it just worsened the gap between me and people in general. I am not about to try to see the positive either. I see things for what they are. And most of them have been negatives.
Imo, I don't think you should introduce him to MBTI. I say just date him and be happy and let behaviors arise naturally without connecting them to 4 letters, as my boyfriend says.
MBTI has sorta subconsciously altered my mind; I'm the midst of deprogramming myself. It kinda reminds me of my AP Microeconomics class in high school, when my professor mentioned: There's no such thing as free lunch. Every time I am going to do something that involves time and obtaining something, I think, "There's no such thing as free lunch." I'm 22, and I've been subconsciously referring to it on a daily basis for over 5 years. I don't think MBTI will have the same effect, but that's because I was able to catch myself before it became an absolute when in fact it's pseudo-science.