ご無沙汰はお互いさまです。

ご無沙汰はお互いさまです。

I am as much in the wrong as you are about not writing before this.

ご無沙汰(ぶさた)はお互(たが)いさまです。

Gobusata wa otagai sama desu.

ご無沙汰 (ごぶさた)

not writing or contacting for a while; neglecting (failing) to write (call, visit, etc.); long silence

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

お互い (おたがい)

mutual; reciprocal; each other

様 (ざま)

mess; sorry state; plight; sad sight; -ways; -wards; in the act of ...; just as one is ...; manner of ...; way of ...

です (です)

be; is

Readings: ム、ブ、な.い

Meanings: nothingness, none, ain't, nothing, nil, not

Readings: サ、シャ、すな、よなげる

Meaning: sand

Readings: タ、タイ、おご.る、にご.る、よな.げる

Meanings: luxury, select

Readings: ゴ、たが.い、かたみ.に

Meanings: mutually, reciprocally, together