I've looked through some of your other questions is this boyfriend that you have the same boyfriend that you have been with for the last 3 years? also I'm curious about your age.
My answer is assuming the answer is yes to the first question and since you mention school I'm thinking you are somewhere in the age range of 17-20.
I think your flattered by the attention of the older man but your not ready to up and move in with him just because you are enjoying his attention. You are in a relationship that isn't really fullfilling your desires of the heart you seem to hold on to it because it is comfortable. Depite the drama you can say you have a boyfriend you don't have to be alone. The idea of being with out a boyfriend frightens you. Back to the older man. He seems wise and full of advise I'm sure. He would love to have a younger woman on his side. This doesn't make him sick it makes him human lol. He is telling you how good he would be to you and that your current boyfriend is a jerk and doesn't know what he has. It seems apparent that you are uncomfortable with the age difference, This i understand. I always said age is a matter of the mind if you don't mind then it doesn't matter. Haha well a few years ago I met a wonderful man who was about 20 years older than I. I was nervous about it but he was a gentleman. after a few months of dating I decided the age difference was just to much for me. He had a son, about my age already, I knew that in time I would want kids and a family and we were just on two very differnt levels in life. I ended it but we have a mutual respect for each other and only want the best for each other. You seem comfortable around him because you have gone to the extent of listening to him tell you how much he love you. My advise to you if all this is somewhere close to being correct ... Love yourself the older man is there as an example that someone else can treat you like a queen. you don't have to stay with a boyfriend who is hanging on to a past affair. Stand your ground with the older man if you arent' interested don't fall into moving in and being a trophy wife or g/f. tell him he is to old if your curious Take your time go on a few dates but don't lead the man on if your uncomfortable . I hope all this helps there wasn't alot of info to work with but hopefully i read between the lines correctly
God bless.