He’s changed, he makes no effort and I’m heart broken?

I’ve known this guy since my teens, and the past 5 years we have had an intensely close relationship. Due to a lot of factors in our life we could never be together, but we have been sexual, along with being best friends. We have known eachother years and years, but the past 5 have been almost relationship like, without declaring it. We would speak everyday, send photos and videos of our day, such insignificant stuff that I took for granted at the time. He would message me every morning and bedtime, we would meet and hug and hold hands, we would talk for hours and hours. Then around 5 motnhs ago something changed, he became slowly more distant, it began to be communication every couple of days, until here I am now at a point where he only speaks to me if I make contact first. We haven’t saw eachother in months and have barely spoke, he always replies usually 9/10 but his conversation just seems off. I have asked him over and over and he just says he’s busy? And that he isn’t different. Even if he replies his convaerarion is different and we don’t seem to have that connection anymore. The thing is I’m so cut up about it, I miss him and how we was sooo much, it’s hard to leave him be and get on with my life when he was such a big part of it, if he ever voiced he wanted me to leave him alone I whole heartly would, but he hasn’t, and I’m not sure what his issues are. Why isn’t he missing me like I miss him 😭 why not it not affect him that we may never speak again. I’m so hurt, and I never thought he would put me through this. He was my go too, my best friend, and now he’s like a stranger. I asked him yesterday for the final time why he doesn’t bother to call or text anymore, and he replied he’s just busy. But he’s still at the same job, and his life isn’t any different from how it was when we used to speak constantly. It’s clearly Ovbs he doesn’t want me anymore, but why won’t he tell me this and inform me on why he’s changed the way he is towards me. It hurts

He’s changed, he makes no effort and I’m heart broken?
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