There are a number of potential reasons why someone might get upset or frustrated when their partner cries. Some common reasons include:

1. Emotional overwhelm: It is not uncommon for people to feel overwhelmed or unsure of how to react when their partner is experiencing strong emotions, particularly if they are not comfortable with expressing or dealing with their own emotions. This can lead to a feeling of helplessness or frustration, which may manifest as anger.
2. Lack of understanding: Someone may also get upset if they do not understand why their partner is crying or what they need in that moment. This lack of understanding can lead to feelings of frustration and a desire to fix the situation, which may result in an angry response.
3. Insecurity: In some cases, a partner may become upset or angry when their partner cries because they feel like they have done something wrong or that the crying is a reflection of their own inadequacy. This may be due to insecurities or a lack of self-worth.
4. Communication issues: If there are ongoing communication issues in the relationship, a partner’s response to crying may be exacerbated. Without effective communication, it may be difficult for one partner to understand the other’s perspective and needs, which can lead to misunderstandings and conflict.

It is important to note that everyone reacts differently to strong emotions and that there is no one-size-fits-all solution to dealing with crying in a relationship. It is essential for couples to communicate openly and honestly about their feelings and needs in order to build trust and understanding. If you are concerned about your partner’s reaction to your tears or if you are struggling with how to deal with your own emotions in the relationship, it may be helpful to seek the guidance of a therapist or counselor.