Give up, girl.
I advise you to give up, although recently "Dearly Beloved" is very hot, and brought Han Shangyan such old man is also on fire. But in real life, Han Shangyan is still very rare. Even if there is a real-life version of Han Shangyan, you are not a real-life version of Tong Nian, and there is a very small chance that you will get together and end up happy.
If you're a sophomore this year, then you should only be 21, and the man is already 31. The first thing you need to make sure of is whether the man has a wife or not, and whether he is married or not. If the person has a family, it is very essential that you choose to give up. First, you shouldn't go and break up someone's family, it's a moral issue. Secondly, the fact that he has a family and still comes to tease you shows that he is not a man worth trusting.
You are still young, stay in school for a long time do not know the social evil, college students tend to be very simple. So this kind of people will generally become the prey of the "old man" with bad intentions, because young and beautiful and good to cheat, the important thing is to spend less money. If you say a few sweet words to them and do a few touching things, they are very likely to take this as love.
While not all college students are like this, most of them are still very good at cheating. So you must keep your eyes peeled to see if you are being preyed upon by the cunning "old man", who you thought had a soft spot for you, but in fact is just a means of escape.
Secondly, even if the man really just simply like you, you finally want to go together is also very difficult. If you don't have the intention to go to graduate school, then he will have to wait for you for another two years. And then wait for you to stabilize your work, at least one year has passed. I believe that his age has no object, the family will be very tight. Even if you can survive the time, will your parents agree to marry a man ten years older than you?
At the same time, the age gap is not just a number. It represents that you have different experiences and grew up in very different environments, resulting in inconsistencies in your outlook. That's why it's so hard for you to overcome the difficulties of being together, and it's hard to go on without a strong heart.