Thank you to everyone that has replied. We actually went out yesterday and it was much better than when we tried it a year ago. He was very understanding with me and encouraging and that in turn made me not absolutely hate it from the start. I am still interested in doing other things as well with him, but I think his attitude about the whole situation was better yesterday and that made it not too bad. He also didn't push me and was very appreciative afterward that I ran with him. As long as he doesn't push me to do this every day I think it will be ok. I actually feel more comfortable suggesting other activities to him as well now.

That coaching thing would be a good idea too. He has always wanted to do marathons and if I can get a bike it would be fun to coach him.

Thank you again for all of your suggestions and reading my post.