pine after (someone or something)
To desire or grieve over someone or something so intensely that one becomes depressed or melancholy. You can't just sitting here pining after your ex-boyfriend. It's after—you need to get out there and live your life! I can't stand these kids who pine after the latest, most expensive tech gadgets, even when they literally have no need for them!
pine after someone or somethingand pine for someone or something; pine over someone or something
to long for or grieve for someone or something. Bob pined after Doris for weeks after she left. Dan is still pining for his lost dog. There is no point in pining over Claire.