All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
As long as you have repented from this sin, then the repentant from a sin is like the one who has never committed a sin, as stated by the Prophet .
Since Allah forgives what is greater than that, which is associating partners with Him, and Allah may accept the repentance of a polytheist and enable him to remain steadfast on the truth if he sincerely repents to Him, then it is with greater reason that Allah accepts the repentance of someone who missed three Friday prayers in a row.
You should not despair of the mercy of Allah, as He is the Oft-Forgiving, the Most Merciful. Allah says (what means): {Say: O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.} [Quran 39: 53]
So, ignore these whispers from the devil; as long as you have repented and regret it, then your repentance is accepted, praise be to Allah.
Allah knows best.