Even the suspicion of infidelity can be enough to ruin a marriage. That’s why spouses want to get to the bottom of the issue as soon as possible, both for their well-being as well as that of their families. While the situation is not always cut and dry, Psychology Today recommends looking out for the following signs if you’re concerned your partner is being unfaithful.

Increased hostility

When a person cheats on his or her spouse it’s very easy to become defensive. This usually turns into hostility towards the other person, which is expressed via harsh criticism or constant bickering. The person being unfaithful may be attempting to shift the blame to the other party by finding fault with behaviors that were previously acceptable. In many cases, this hostility may seemingly come out of nowhere.

Uneasy friends and family

News of infidelity often travels fast, even if the spouse is the last to know. This usually causes loved ones to act uncomfortably around the unwitting spouse, either avoiding his or her company altogether or being overly nice out of sympathy. It’s common that people will not want to be involved in a personal matter between a couple, so many stop short of making the bad behavior known.

Changes in schedules and finances

Changes in routines and finances may also be huge red flags. A spouse might suddenly go on frequent business trips or have a lot of late nights at the office when it was never necessary before. He or she may also experience a lot of problems with vehicles or traffic that cause a late arrival. In the same token, these changes may also be accompanied by financial ones. Savings may be depleted by expensive meals or costs for lodging away from home, and costs may continue unabated as the affair progresses.