<human>: Can you give me the gist of the text in a nutshell?

My SO of over a year and a half and I go to a Law School where moot court (a competitive event law students do) is taken very, very seriously. Every year, we have a university selection round where participants pretty much stop doing anything else for 2 weeks. Last year, my SO and I both did these selections, and while I still wanted to make time for him (at least 10 minutes or so every other day), he didn't reciprocate. Those 2 weeks were part of a bad phase in our relationship, and I still have memories from that time, where I generally felt extremely hurt and was on the brink of breaking up with him.

This year, I am not doing the moot court selections, but he is. I have taken up another project, and the next couple of weeks are going to be super stressful. I'm the kind who needs my  SO more than ever for moral support during such times. However, as he's doing these selections, I'm really afraid he'll disappear from my life for two weeks again. He verbally reassured me saying he's different, and we're different now. But I can't help over-reacting to small things he does, like not answer a call, or not meet me for two days in a row (I normally wouldn't react like this- but he normally will meet me every day without fail). The result of this is that he is annoyed, and I'm afraid that I might actually be pushing him away by over-reacting. 

How do I stop my insecurity from turning this into a self-fulfilling prophecy?
<bot>: I am insecure that my SO will disappear from my life during a stressful period, like he did in a similar period last year. My insecurity and subsequent clinginess is pushing him away.