Can or should I ask my significant other to stop talking and to not associate with his ex? If so, how?

I always like it to talk about these things openly. Don't expect him to stop talking or to associate with his ex, but talk to him about how you feel about his relationship with his ex. Ask questions that you might have and try to decide on what to do together. If he listens, acknowledge this and thank him for thinking with you, even if it is the most decent thing to do.

You can ask and depending on him/hers reaction take it from there,it could mean that the person is not over his or her ex yet but just dont be agressive over it

Communication is key to every relationship. If it makes you uncomfortable yes you need to tell your significant other that it bothers you. It should be when its quite and then ask can you talk to them.

Confront them about it and state that it's making you quite uncomfortable, then politely ask them to stop.

I would have a talk with him in a calm setting, and explain how it makes you feel. Unfortunately we cannot control others' actions, and there is not a guaranteed method to prevent our significant others from talking to certain people. But like the other person said, if he cares and loves you, he will let you know that there is nothing to worry about. Trust comes with time:)

Yes. You can ask that to your significant other. BUT. You can do it in non judgmental way, You can if why is he/she talking with his/her ex. Tell him/her what you feel about it (her/him talking to his/her ex). How? There are different ways. If you think you cannot do it in a verbal manner and could mess things up then you could write it. Make sure you must give the letter haha

Yes as long as its done in the correct manner speak calmy to your partner make them understand where your coming from

I think it is more important to first address why them speaking with their ex is concerning or upsetting. How does this make you feel? By digging deeper into your feelings surrounding the circumstances you'll be better able to communicate them to your significant other. With that knowledge, I think the best action would be to approach your partner and open a discussion. Share with them that speaking with their ex makes you upset, and if their are other feelings that bubble up express them, as well (perhaps it makes you feel it is a breach of trust in the relationship, and it is okay to express that it may make you feel jealous, insecure, or unworthy in some way. I have felt the same in similar situations and wholeheartedly empathize). It's important to approach these situations calmly, to ask questions, and to help them understand how it makes you feel to allow them the space to respond and see your point-of-view. Afterwards, if you still feel the same way about them communicating with their ex, then let them know that continuing a communicative relationship still makes you uncomfortable. Again, I believe it is important to open these issues as a discussion to allow all parties an opportunity to feel listened to and be able to come to a mutual understanding.

Look you should confront to them and ask them to be honest with you . Maybe your insecurities are making you feel not worthy and that's why you are scared your partner will leave . Remember they were your partner's past you are their present . So do confront them about your feelings but you can't force people to act like you want so be confident in yourself . Never forget you are important and loved ❤️. Don't hide or bottle up your emotions from people cuz they will make you feel bad and try to work on your relationship and if you feel you are the only one putting efforts then they are not worth it for you . In conclusion I will say that do confront them and believe in yourself ✨❤️

If his/her ex is toxic. Yes you can. You can tell him/her how it affects the relationship between You both.