<human>: My boyfriend of almost 2 years, and (former?) best friend of 5 years broke up with me past February. He claimed that I was too dependent and according to him we fought a lot. I wanted to continue working on it but he didn't. We had small fights/disagreements on a weekly basis and bigger issues about once a month. Mostly related to how much time we spent together, and how much attention he showed me.

We did go back to being friends, and in the meantime I've had a few dates with people and even had a short fling with someone, and I thought I was over him. But he met a girl last week, and it seems as if they hit off pretty well and I'm just devastated.

To make the problem worse I'm currently trying to switch to another study and he's the only one that can help me with problems I don't understand (following the course at home), and the exam is coming friday.

So I can't just not see him, but whenever I see him and even if I'm alone I'm terrified at the thought of my status as his best friend being replaced by that other girl, and to a lesser extent that there's no chance for me to get back with him.

I honestly have no idea how to handle this but I can barely focus enough to study, and I just need to find a way to get my mind off him. I know it's a broad question and that there's no real answer but I'm hoping anyone has some anecdotes or tips/advice that may help?

Can you summarize the given text in a few sentences?
<bot>: Ex-boyfriend whom I still have feelings for found someone else, no idea how to handle the fact that he met someone else.