Is it normal to keep in touch with an ex?
Yes, plenty of people stay in touch with an ex, especially if the breakup was amicable or they share friends, kids, or a community. Whether it works depends on the boundaries and whether everyone involved feels comfortable.
It’s pretty common to keep some kind of contact with an ex. For some people that means an occasional friendly check-in; for others, it’s an ongoing friendship. There’s no rule that says you have to cut someone off just because you used to date.
The important part is whether the contact feels genuinely platonic and respectful of your current life. If you’re hiding messages, still hoping to get back together, or using your ex as your main emotional partner, that’s worth being honest with yourself about. If you or your current partner feels uneasy, a conversation about boundaries is usually more useful than pretending nobody has feelings.