Been married 10 years. The love in the beginning is so overrated it isn't funny. It is infatuation, lust, realizing you're getting married with all the crap that goes with it.
If you have kids, "love" is tested when you are counting the number of diapers you change as if it is a competition. Love means giving me an extra 5 minutes of sleep because I was the one up all night.
Love 10 years and 3 kids into this marriage is nothing like the love in the beginning of this relationship. Then, love was a great feeling, demonstrated a lot by sex, hanging out with your new spouse. Now, it is tested a lot, I don't really know if I like her sometimes. Again, love now means give me some respect and time alone so I don't go freaking nuts.
Temptation is there it seems all the time with all the school parents who are in the same situation. They can't stand their spouses most of the time. They probably would never cross the line but they sure do flirt like crazy. My wife accused me of having an affair because I got too close emotionally with a neighbor mom. I was working nights and had time in the day to talk to her and realized I felt very at ease talking to her. I became flirtateous but didn't turn into an affair. To this day my wife does not talk to her but I know she has the same things going on at her work. Double standard.
Sorry to ramble but I know where you are at. You love your spouse but realize that there might be someone out there who you like a hell of a lot more. Until it gets real ugly in the marraige, you can be tempted, have platonic relationships (that can involve flirty or downright nasty talk), but if you decide to have a physical encounter, you are crossing into another whole dimension. Good luck to you.