I was in love, and love makes all men frantic.

[ἤρων τὸ μαίνεσθαι δ᾽ ἄρ᾽ ἦν ἔρως βροτοῖς.]

Euripides (485?-406? BC) Greek tragic dramatist

Antigone [Ἀντιγόνη], frag. 161 (TGF, Kannicht) [Haemon?] (c. 420-406 BC) [tr. Wodhall (1809)]
    (Source)

Barnes frag. 18, Musgrave frag. 7. (Source (Greek)). Alternate translation:

I was in love; and love, it turns out, is madness for mortals.
[tr. Karamanou]

I was [they were?] in love: and that showed that love is madness for mortals.
[tr. Valtadorou (2020)]