When will this stop hurting?

Heartbreak rarely ends on a particular day. It eases in waves, with good days turning into good weeks, and setbacks getting shorter. Many people only realise they're healing when they notice they haven't thought about their ex all morning. There's no fixed timetable, and anyone who gives you one is guessing. If you're struggling to function after months, it's worth talking to your GP or a counsellor.