Oh my goodness, your boyfriend needs a new attitude. There's no excuse for belittling you for not keeping up with him. We are all different people and by no means can he expect the same from you just because he can do it, that's absolutely ridiculous!!! I won't keep going on about that subject but you don't deserve to be treated like this.

On the other hand, you can get a road bike for around $600 new. I know it's not a small business but if there is a 'Performance Bike' near you the bikes are very reasonably priced. Best of luck to you but for the record I think you are WAY stronger than you are giving yourself credit for. Six mile run a day! wow!!!