Tiptoes
(2004)

Carol (Kate Beckinsale) and Steven (Matthew McConaughey) get married and have a dwarf son.

The couple separates (Steven can't handle having a dwarf son) and Carol temporarily moves in with Rolfe (Gary Oldman).

Lucy (Patricia Arquette) and Maurice (Peter Dinklage) also break up.

The film ends with Carol and Rolfe sharing a moonlit kiss.

Thanks Ellis!