That's just not how it went down. Terese was not jealous of Lauren at first. This is a quote from Perfect Blend:
http://perfectblend.net/neighbourhoo...lis-terese.htmThough Terese was secure in her marriage, and had no problem accepting Brad's old flame living across the street, Lauren found it slightly more difficult to deal with, failing to tell her husband Matt about any of it.
Terese started to become insecure after finding out about Paige, but the kiss between Brad and Lauren in Adelaide is what really caused their marriage to start falling apart. That kiss was definitely hot, heavy and flirty!
Terese has behaved badly at times and that certainly didn't help the situation, but blaming her for the breakdown of her marriage doesn't make sense.