1. It's dangerous to have a casual relationship with your predecessor
You've been with your ex for a long time and you have a deep understanding of each other. As a causal encounter, you may have read many articles about how to run a successful FWB relationship. And you must also know that you cannot have too much psychological communication with your own FWB, in case you will have psychological dependence on each other. It's also a dangerous place to develop such a relationship with your ex. It's very difficult to ask for benefits from an ordinary friend. When you're with your ex, there's more to watch out for. If you don't get the right balance, things will get very bad.
2. You can resume your dating relationship
Maybe in your opinion, in a FWB relationship, it's easy to have no emotional attachment. But it's not the same for everyone. Whether you want to admit it or not, when you break up with your ex, you still have more or less feelings. If there is no intersection in your life, these remaining feelings may gradually disappear. But if you decide to jump into an NSA relationship with your ex in this situation which happen a lot on dating apps for hookups, things can get complicated. It's likely that one of you has been wondering why you broke up and what it would look like if you didn't. So you may want your ex to change his mind and get back together with you. That's another reason your relationship is very dangerous.
3. You don't think of your ex as a real FWB
People's feelings are memory. When you've been dating your ex for a few years, it's possible that your nerves and muscles have already remembered how you feel when you date together. So even if you convince yourself that he's just your sexual partner right now. But when you make love together, you still subconsciously think of him as your boyfriend, maybe you don't realize it at all. If you haven't really come out of the pain of breaking up with your ex boyfriend, you'd better not join in such a relationship.
