I didn't cheat!! 😢💔

A while ago I was talking to an ex (1500 miles away) and Husband saw some questionable text. I couldn't explain them away and it came around it was an emotional affair. So I stopped talking to him and block him. My husband and I moved on to be in a happy marriage.

2 night ago we were out last minute Christmas shopping and a different friend texted me saying hi what's up. We talked husband saw no a big deal end of story.

Last night he texted me, I hadn't spoken to him in a month or 2 other than Saturday. Well he was saying how if your weren't married would you be with me. I miss you.i responded with lol's and happily married, ect. I deleted our conversation, but didn't block him. Husband was on my tablet and a message bubble pops up miss you text me with a number.

Of course I explained what had happened and he said why didn't you block him ect. So I did. But now all of our old trust issues are back and I didn't do anything.

How can I fix my marriage this time??