Me and DP have been together 18 years (engaged for 17 - no need to rush these things!). We have two amazing kids and a very happy relationship.
I met DP when I was 18 and he was 25. I couldn't believe that he wanted to be with me tbh. He had split with his ex a year previous to us meeting as he caught her shagging a bloke behind a pub - classy!
I have always been insecure about her. I know he would never cheat on me with her or anyone else. I know that he loves me and puts me and our kids before anything. However it all comes down to the fact she was 25 and more grown up than me when I was 18.
Anyway, fast forward to this term and at a school function I realise that she has kids at DS school and even one in DS year. Suddenly I am an insecure 18 year old again. I know I sound stupid, and when I tell my DP he's going to call me a silly moo and give me a hug. Wish I didn't feel like this.