<human>: Hi, so I have been good friends with my s/o, lets call him John, for 11 months and in the past couple of months we started dating and getting pretty serious. We spent a lot of time together and know a lot about each other. Things were going great until he got a contract job in Alaska for 4 months. So now, we have been apart for about 3 weeks and I am losing my mind. 

I have issues from my past and can never know when I am over reacting, creating things in my head, or when things are actually real. So this sudden long distance is a challenge for me. I also have been in an LDR before where my s/o cheated on me. Turns out he had been living a double life. Doesn't help.

So anyway, John was very talkative the first two weeks and then all of a sudden...there was a lull. No romantic talk, no pet names, his call patterns changed for the worse. 

Now keep in mind he is in a 3 week training course right now for this job that is very intense so I cant tell if I am just forgetting he is very busy and under a lot of stress. I have talked to him and he says he is not there to meet people, this is his dream job and he has to do it. I understand that and I am happy for him but waiting at home is so difficult. Especially since once he finishes the course he will be on a ship for 3 months with little to no communication. 

The issue is this: He has been there for 3 weeks. First two he was talkative, talking about us, about the future, about how much he misses me. Now? Its me initiating most conversations and they are either just about sex or small talk. He hasnt been as open and he is quick to get off the phone. This is his finals week but, it just isnt helping me feel secure.

I'm afraid of losing him and I dont want to get hurt. I want to see him in 3 months when he gets home and have things be better than before but I am afraid I am the only one who will stay true. 

Any thoughts? Everyday is getting harder.

Could you distill the essence of the text into 1-3 sentences?
<bot>: In temporary LDR. He seems to have gotten a little quiet and I am insecure about what will happen. Thoughts please!