The heart wants what the heart wants. But with you (hopefully) graduating soon and them just starting out on their college journey, the situation will soon be very difficult. Depending on how long you’ve felt this, you might choose to just stay quiet and see if the feelings subside. Or, if they reciprocate the feelings, you can get together but be very clear with each other about the boundaries (will this only last a year, will you try to keep it going, etc.). Remember, they will change a lot during their next four years, and you will also change a lot in your first couple of years out of school. There’s nothing wrong with (mutually) exploring the relationship and seeing where it goes as long as everyone is on the same page.