Being communicative is hard when the person you are trying to communicate with isn’t very good at communicating. Yet you can help them be more open to talking if you talk to them more. It will help them get more comfortable talking to you and maybe even others around them and just help them open up more in general. It’s not great to think they don’t want to talk to you, which can be the case sometimes. If it’s they don’t want to talk to you or if it’s they don’t know how to communicate then ask. Not asking or doing anything to fix the situation will ruin the relationship between you both even if it means getting out of your comfort zone. You should talk to people more and get them out of their comfort zone because not talking to anyone isn’t beneficial to anybody. It just creates feelings of loneliness.
It may also make people think you don’t like them and it gets you in a habit of not talking to anybody in general, like your friends and family members which again gives the impression you don’t like them. It’s a never-ending cycle: a lack of communication, to feeling alone, to make others think you don’t like them. Don’t just cut off communication with somebody. That makes you look like a bad person and makes people not like you, and it will make that person question what they did. Just be honest and tell them your feelings.