Why don't he just block me, instead of avoiding me?

So I came to realize, that my friends with benefits is in investing into another friends with benefits relationship. For one, he don't hit me up often nor ask me for sex, and when we do have sex, it seems to be so dry and played out. Then when we do talk, he usually drops off and not say anything. And now, I feel that he is avoiding me because he has a new toy to play with. Now don't get me wrong, we have been in each others lives for the longest. And yes, some things do begin to get old and played out. But my thing is, if he isn't fucking with me like that, sexually or communication. Then why don't he just block me instead of getting offline when I get on. And if he has this new bitch! that he is falling for and getting more sex out sex or just having better sex. Then why is he still having the door open to me?
Why don't he just block me, instead of avoiding me?
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