Prospect is too formal

I (F 28) had initiated a JS invitation to a prospect (M 35) which he accepted. There were no hi's or hello's post connecting, so I decided to take the lead and start a conversation and he replied in a very timely manner whenever I asked him anything. We exchanged numbers and it was usually me who would initiate the conversation, he always made a point to reply on time, however his tone was always formal. I was skeptical because this isn't something that I experienced previously, so to check whether he's actually serious I asked if his parents would be comfortable to speak with my parents and whether we can meet and he agreed to it without taking much time. When we met, I found him very attractive and if anything he was very polite and gentlemanly but again too formal. When I did try to break the ice and ask him why he's too formal, he said he was introverted growing up and has a rather limited friend circle. He politely replied to all my questions and some of his answers were very philosophical and deep. I did ask him why he's unmarried for so long and he simply said he's usually afraid of rejections and sticks to his routine instead of thinking too much about marriage. He's professionally & educationally very accomplished but I felt he was extremely shy and sometimes struggled with eye contact. We met twice and I did ask him if he's interested in moving forward and he said yes only if I was comfortable, he has also duly kept his parents informed. I too am very inclined to proceed but is such behaviour common or he's just introverted. He's very nice, understanding and good looking man but sometimes I wish he's not too formal and be bit interactive since it would give me better understanding whether he's interested in me or not, especially since I am very interested.