Please tell me this won't last years

It's been a bit over a month and it started getting worse on the 1 month mark. I had been able to maintain no contact up until this week. The urge to text him got too strong. I cry every morning, every night, every alone moment. The rumination is the worst part. I feel so trapped in my own head. Leaving the house makes me so anxious because I'm terrified of seeing him with someone else. I keep seeing other people say they've felt like this for years. I need to hear from people who felt worse 1 month in but got better soon after---especially other women. I need to know this will get better, please.