Exactly the first half (or a bit more) of movie Her by Spike Jonze. Lonely people got their emotions up / 'fall in love' with uncritical always-positive mirage and do stupid shit.

This a variant of classic Midlife crisis when older men meet younger women without all that baggage that reality, life and having a family between them brings over the years ( rarely also in reverse). Just pure undiluted fun, or so it seems for a while.

Of course it doesn't end happily, why should it... its just an illusion and escape from one's reality, the harsher it is the better the escape feels.