Is it so uncommon?

So my hubby and I were out and about last night, and of course we were being our affectionate selves. As I was telling him to stop tickling me, some other patron said "Enjoy it - it won't last". I could've said something in response, but I am really trying to think before I speak. So we kept walking and this lady said something about being jealous. I informed her that the only reason I asked him to stop is because I didn't want to fall down because I was being tickled. I didn't feel obligated to tell her how long we've known each other or how long we have been together and that we had three kiddos at the house. Again, she expressed her jealousy. A bit later, my man and I were discussing the odd encounter we had just had. Is it so uncommon to see pda? Are people wound so tight that the norm is to see miserable, unloving couples - or is marriage taken so lightly these days that it's simpler to change your mind? I realize that it's fun to date somebody, decide you wanna get married, or play house (and I'm sure I've been accused of that- and that's ok) but I wish people realized that our relationship had several obstacles and challenges. Another thing I wish people realized is that we have never had a fight. Sure, we've had a few bumps in the road, but people who truly love one another will talk and work things out. I know I'm still a novice at this marriage thing. But is it so uncommon (or difficult) for people to have a happy, loving marriage?