Thank you for the all responses. I do think I should clarify somewhat. The 2 month hiatus will amount to almost a 3 month hiatus because after the 2 month "study period" we will be across the country on vacation for 3 weeks.
Also, I have agreed to refraining from starting any new relationships or new dates but currently I am seeing someone Joe (though that maybe ending soon). Assuming me and Joe remain together we would have been dating for about 3 months and I think it would be wrong for me to say can we hit "pause" for almost 3 months. I did ask Dan to simply let me compromise by just seeing Joe once per month in that study period but he objects to that.
I do have emotional support from other friends and family. I suppose part of my concern is that he will then want other blackout dates: the holidays, starting a new job. After reading the responses, I am definitely in need of being more compassionate and need to consider his perspective a bit more and look at some of the suggestions you all made.