Although most boyfriends you have probably won't cheat on you, that doesn't mean it's impossible. If you suspect your boyfriend of cheating, you should pay attention to a few key behaviors that may confirm that he is cheating on you. Of course, there is a major difference between behavior that indicates that he may be cheating and concrete evidence that he is cheating. Don't assume you've "proven" him to be a cheater unless you have the latter, as the former can be caused by a number of other reasons.
Look for sudden changes to your usual routines. While routines do change, they are normally gradual changes. For example, it is not uncommon for a couple who has been together for a long time to have sex less than they did when they first got together, but it is less common for sex to immediately dwindle from, say, three times a week to once a month.
Look for signs of other women. The scent of a different perfume and lipstick on his collar are telltale signs, but you should stay alert for other signs as well.
Ask him routine questions and gauge his response. Someone who is cheating will often become more defensive than someone who is not.
Ask him. This is the most effective way to find out, and it is more effective than any other indicator. You should use the other indicators when you ask him, though, rather than just assuming that he is cheating based on them.
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