Is there reason to believe from the text that Peter was no longer included and numbered among the disciples (followers of Jesus, believers, those who would be saved, have eternal life) when the Messenger makes this statement?
“But go, tell his disciples and Peter that he is going before you to Galilee. There you will see him, just as he told you."” Mark 16:7
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And this on account of Peter’s denial thrice of Jesus
“And immediately the rooster crowed a second time. And Peter remembered how Jesus had said to him, "Before the rooster crows twice, you will deny me three times." And he broke down and wept.” Mark 14:72
And also on account of these words of Jesus
“So everyone who acknowledges me before men, I also will acknowledge before my Father who is in heaven, but whoever denies me before men, I also will deny before my Father who is in heaven.” Matthew 10:32-33
Which aligns with other texts that speak on the subject of being outside of salvation/eternal life for denying Jesus Christ
“No one who denies the Son has the Father. Whoever confesses the Son has the Father also.” 1 John 2:23
And consequently you cannot have that which you deny
“And this is the testimony, that God gave us eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life.” 1 John 5:11-12