How do I delete an unusable number from my contacts list?

When I and my husband traveled overseas we got sim cards with different numbers. I added his new number to his listing in my contacts so that I could call and text him. Now that number seems to be the only one recognized by my iPhone SE, even though I deleted it from my contacts and changed the way my husband is listed there. Although I can call my husband on his regular number, every time I try to text him I get a message that the number has too many digits I.e. it’s using the overseas number (with country code which I never even added.) WHAT’S GOING ON????