<human>: Give me a shortened version of the text

Throwaway, of course.

I am carrying issues from previous relationships into my 5 month relationship. He's been really great and understanding, for the most part, but I feel like I am slowly destroying something really good. My boyfriend has a job that requires his cellphone to be locked up during the duration of the work day. This means, at times, I won't hear from him all day until we talk later in the evening. Sometimes he sends me e-mails from work and sometimes he can text on his lunch break, but not always.  For reference, we're both 24, his last girlfriend was for 2 years, and ended 3 years ago.  My last relationship was 9 months long, ended about 15 months ago.  I also had 5 year relationship previously that ended up long distance, him cheating on me, and we broke up. 

My last relationship ended after my ex slowly cut off contact. For the week or so before we broke up, I wouldn't talk to him all day, and he'd ignore my texts. He was younger than me, and in many ways, very immature.  The problem now is, every time my current boyfriend shows any sort of inconsistency (ie, last night, I called him late, and I haven't heard from him yet today), I worry that it's the beginning of the end, even though the rational part of me realizes that people's feelings don't change in a day. And he has been very honest and open with me so far.

My question is, how do I know how much is me and how much is him? He's been really understanding so far, but I think it's unfair that if I don't hear from him consistently, I (mostly internally) freak out. What do I do?  I don't want to be "missing the signs," but I am tired of being paranoid.
<bot>: I assume the worst when there's any inconsistency in communication with my boyfriend.  How can I fix this on my end?