Relationship after friends with benefits for 7 years?

I have started a "friends with benefits" type of relationship 7 years ago. At first, it was only the call and occasional sex. However, from then it has developed into something more from my perspective. We have started to get to know each other and started to spend more and more time together. 3 years ago he had to leave the place he was staying at and moved with me for, theoretically, a week until he can find a place. Since then, we have been living together and have been doing the normal things a couple does (celebrated holidays together, family visits and so on).
After living together for 3 years, this summer we went on vacation together, at a music festival and then to visit our families (mine and his both, we live in different cities). From my point of view, we had a great time. After receiving a wedding invitation, I asked him if he wanted to go with me and he said no. When that happened, I asked the dreaded question of "what are we?" and if he wanted to be with me. He is currently ignoring my question and avoids giving me an answer because "it is not that simple".
I told him that he has a few days to answer my question, if he wants to be a couple. Otherwise, at the end of the week I will consider that he does not want me and we should go our separate ways. What do you think? How should I proceed?
Relationship after friends with benefits for 7 years?
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