If you’re having vaginal sex, the “tightness” of the vagina (its elasticity) has to do with a number of factors: how aroused you are, your menstrual cycle, and any medications you’re on. It has nothing to do with how many partners you’ve had.

If you’re having unprotected sex with a partner other than your boyfriend, it’s extremely important that you test yourself regularly. Transmitting an STD to your boyfriend isn’t just a way that you can get caught cheating, but puts his health at risk. [3] X Research source

Intuition can be a very powerful sense. Your boyfriend might have a hunch that something feels off or different in your relationship, even without any obvious signs. This can lead him to suspect that you might be cheating.

Confessing that you cheated doesn’t have to end the relationship. Many couples are able to move past this and have an even stronger relationship than before. After you confess, you’ll have to spend a lot of time rebuilding trust with your boyfriend. Understand that you’ve hurt him and work with him to make amends. Going to couple’s therapy can help you move past what happened. Couple’s therapists are trained to deal with the fallout from infidelity, and can facilitate important conversations between your boyfriend and you.

If you feel like telling him could pose a serious threat to your physical safety, keeping quiet might be the best option for you. Your safety is more important than anything.