Your spouse leaves the room each time the cell phone rings, and it rings a lot more lately. She works late a couple of times a week. Or, he takes care of the bills now, when you used to do them together. Another business trip?
While California is a no-fault divorce state, fault such as adultery can be used to influence settlement negotiations, or you may be entitled to a credit if community assets were used to keep the mistress in the lap of luxury. In fact, if a substantial amount of community assets were spent on the new boyfriend or girlfriend, you may also have a breach of fiduciary duty claim against your soon to be former spouse.
Spouses suspicious of their partners have never had it easier -- whether by making use of devices like global positioning satellite (GPS) devices placed inside the family car, or snooping through electronic communications on cell phones, computers and Facebook.