Here are the top ten signs to look for that might mean your partner is cheating:

2. S/He always has a reason you cannot hang out or visit their living space. Not being able to visit, announced or otherwise, could mean there is something to hide. In the early stages of a relationship, this boundary is expected. But as time progresses and the boundary remains high, cheating might be the reason.
3. S/He no longer initiates or seems interested in sex. A sudden decrease in interest in being intimate could mean that someone else is satisfying your partner.