I'm a little confused, but I feel like I understand tho, could someone help?

So, I get that friends with benefits are only just in it for (SEX) - no strings attached. But if you and your friends with benefits both have feelings for one another, or if they confess there feelings to you as well. Then why do they stay quiet, and decides to no speak with you. Like, if I would to send him a message right now. He'll respond, but just there. week before last, him and I was talking. I was the one to initiate the conversation 1st last time. But he and I did speak. But now he isn't saying much to me @ all. At first, I thought that he was avoiding and ignoring me. Why, I do I feel that way, well. Each and every time that I would get online, he would get offline. But, I also would do the same with him, I started doing that to him 1st. So this time, today I decided to stay online and not log off If he got online. So I guess once he was online, he stayed on too. He was last active like 35 minutes ago. He and I just didn't speak I got no message from him. I mean, Sure, I do feel like the sex from last time between us was weird and awkward. I personally don't feel like we sexually satisfy each other anymore, well at least I can't seem to get off with him. But now I am curious, to why we have this good connection and we get along with each other, really well. But for some odd reason, we just don't talk. Like, I'm sure he is into someone else, or maybe it just isn't the right time he wants to talk with me. I don't know, he always come back around anyways lol. But I just don't know why the conversations between us always become inconsistent. He usually pulls back before I do, so any advice or solution?
I'm a little confused, but I feel like I understand tho, could someone help?
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