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When breaking off an online relationship, especially one that was casual, there's no need to give a laundry list of reasons. If you're sending a text or email, keep things brief. You don't owe this person a detailed explanation. If you felt the two of you wanted different things, you can say so. Try something like, "I got the impression you wanted something more casual. That's fine, but I'm looking for a real relationship right now." If the other person is disappointed, do not try to offer comfort. Rejection hurts. If the other person was more invested, being rejected may be a major blow to their pride. If you offer comfort, this may come off as condescending. Once you tell them you're not interested, stop contact. When you meet someone online, it's often easier to keep up contact after the relationship ends, but this sends mixed messages. Once you've broken things off, cease social media contact, at least for a while. Give the other person time to understand the romantic part of the relationship is over. Online dating can work for many people, but you may not be approaching it effectively for yourself. If you frequently break things off with online matches, spend some time viewing your approach to the online dating world.  Be honest and specific in your profile to narrow down the number of matches. You may be spending too much time talking online before meeting in person. Stick to a few conversations to establish whether you have something in common. Then, meet in person. This way, you'll be able to tell right away if this person is right for you. You can also try meeting people other ways if you don't like online dating. Try going to clubs or volunteering to meet potential romantic matches. In the event the other person gets aggressive, react appropriately. If the other partner threatens to harm you or themselves, cease contact. If you believe your safety is being threatened, contact the police. Online harassment can be very dangerous.
Do not say more than necessary. Avoid attempting to comfort the other person. Stop contacting the person after the breakup. Evaluate your approach to online dating. Deal with aggressive reactions.