TL;DR: Bruce is pushing for me to enter a relationship with Mary, and I like Mary, but don't want any relationship right now, and I want him to back off.
Me: I am not interested in a relationship currently, for reasons not pertaining to the question, not in a relationship
Bruce: An excellent long-term friend, very relationship oriented, in a relationship with Alice
Alice: A good friend, in a relationship with Bruce, excellent friends with Mary
Mary: A good friend, very alike me, excellent friends with Alice and Bruce, not in a relationship
Recently, Bruce and I were sitting together, having a conversation about everyday affairs, when he mentioned that he and Alice had been talking and had agreed on something. This wasn't special - they are in a relationship - but he went on to say that they had agreed that Mary and I were perfect for each other, and that we should begin dating.
This is strange, as it had never come up before, and Bruce knows I'm not looking for a relationship. He outlined his reasoning, which mostly consisted of the fact Mary and I are similar, and waited for my reaction.
I calmly explained that I was not currently looking for a relationship, but he did not want to accept this. He is the type of person who believes that being in a relationship is always beneficial. He really believes Mary and I would be perfect for each other, and he left saying "this isn't over."
This isn't the first time things that "aren't over" are very over. But he came back to me day after day, refusing to let it drop. I would be reading a book, and he made a comment that Mary would love it. He asked me how I was doing in school (he knows full well I'm at the top of my class), and when I mention how well I'm doing, he responds 'oh that's great, did you know Mary is at the top of her class?'
Other friends make fun of me for not wanting a relationship, and interpreting every time I talk to a woman as flirting just to give me a hard time. This doesn't bother me, as they drop it - it was only an excuse to tease me about a facet of my life that is radically different from theirs.
But Bruce insisting I would be a good match for Mary is unsettling, as he doesn't understand when to stop. He also recently asked me multiple questions on how I would react if Mary attempted to 'ask me out'.
I don't run into Mary every day, so I'm afraid he will attempt to 'set us up' without my knowledge. He is in constant contact with her and Alice, but I am in limited contact.
I will be at the same event as Mary in a couple of weeks, so I suspect Alice is pushing Mary just as hard to get Mary to ask me to enter a relationship and might have met with more success than Bruce.
How do I get Bruce to stop pushing me to enter a relationship with Mary, while not destroying my friendship with Bruce?
Note: I'm not worried about my friendship with Mary, unless Mary does something rash, which would be addressed in a different question.