My boyfriend has been acting weird and distant?

Anonymous
So my boyfriend has been acting distant towards me lately. I'm worried something may be up. I moved in with him in May and we have been together for a year now. He is in the military. I moved away from my friends and family and left my job to be with him when he asked me to. Anyways, his strange behavior has started about about a month ago. There's also a female friend he has that's kinda making me uncomfortable. She is a girl he used to work with and used to have strong feelings for. They slept together once after she got out of the military but she moved away to Texas, he lived in california, this was all before me by the way. Anyways she basically friend zoned him, then disappeared for awhile. She resurfaced after I started dating him asking how he was over text and what not, apparantly she went back with her ex bf and moved to new Jersey. Well I guess something happened and she moved to Nebraska and was having problems with her bf. I believe they broke up and she talks to my bf a lot. I've seen him send her a text saying he misses her. She disappeared again for two weeks and then try him saying she tried to commit suicide. My bf was texting her while I was sitting there and I saw him send her a text saying he will always be her friend and wishes he could be more. I asked him about that and he said he meant as more than just a friend over text. Anyways he went to japan for a week, and since he's came back he's been very distant from me and seems not to want to be around me. Yet she texts him every morning and I found out he was talking to her when he was over seas, I don't know what aboit, he just told me he did and I knew cuz she was messaging him on fb instead of text cuz she didn't know he was back in the states. I asked him if anything was wrong and he said he's just been bored, feels like he gained weight and just feels in a funk. I'm worried it's maybe he wants her back and is depressed about it? My feelings are so conflicted and I want to trust him...
Updates
+1 y
I wanted to add to this that she is in Nebraska and we are in california. I have mentioned it makes me uncomfortable, he tells me she's just a friend and I shouldn't need to feel jealous. When he told her he missed her that was before I moved in, yet he still after that was pursuing me hard and telling me he loved me. Now he hardly even talks to me. Also she is a college drop out and has no job or money and was separated from the navy for DUI and making accusations.
Updates
+1 y
He told me tonight he wanted to break up cuz he isn't emotionally ready. Fuck it
My boyfriend has been acting weird and distant?
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