<human>: We've been together 6 years now. In the beginning of the relationship we had a lot of issues as I'd say we were both very jealous, insecure individuals which led to many arguments.
Recently, I've begun to experiment with different 'sexual avenues' for lack of a better term, and I've spoken to him about this. I've asked him if he would be interested in going to a strip club with me, if he would like a threesome, if he would be interested in watching porn together etc. Just anything that I think I may enjoy and hopefully he as well.

He's answered no to all of the above. He doesn't want to. I asked him if there was any particular reason as to why he wouldn't and he just said no, he didn't want to.

Today, I asked him he could get into the specifics of his reasoning and he said it's because 'he has his reasons'. Very vague, so I asked him once again. It's been SIX years I'd expect better communication by now. Anyways, the last thing he said is it's things like this that have caused problems with us in the past.
We were both very jealous people back then, and I was VERY young. I have obviously matured and changed a lot. For example, I used to be completely against threesomes, however, over the past year, I've realised that it's something that I think I may actually really enjoy EXPERIMENTING with, same with strip clubs with my SO.

It bugs me that I had to pry out a reason from him and even then it was something as vague as 'the past' and said he'll explain it some other time.

What would you do in my situation? Am I being unreasonable in wanting him to at least be able to communicate his feelings on the matter with me?

Even yesterday I asked him if there would be any specific roleplays he would like to try and even then he was very awkward about it and wouldn't mention any.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: boyfriend finds it very awkward to communicate about anything sexual. He doesn't want to experiment with anything because in the first year of our relationship we were very jealous people and this led to many arguments. In short, I'm not.