When trying to determine if an ISTJ (Introverted, Sensing, Thinking, Judging) likes you romantically, there are several key indicators to look out for. ISTJs tend to be reserved and private individuals, making it challenging to decipher their feelings. However, their actions and behaviors can provide valuable insights. Here are some detailed descriptions of how an ISTJ might behave if they have romantic feelings for you:

1. Consistency and reliability: ISTJs are known for their dependability and commitment. If an ISTJ likes you romantically, they will make an effort to be consistent in their interactions with you. They will be punctual, keep their promises, and follow through on their commitments. They want to show you that you can rely on them and that they take your relationship seriously.

2. Increased attention and engagement: ISTJs are typically reserved and focused on their own tasks and responsibilities. However, if they have romantic feelings for you, they will start to pay more attention to you. They may initiate conversations, ask about your day, and show genuine interest in your life. They might also remember small details about you and bring them up in future conversations.

3. Practical gestures of care: ISTJs express their affection through practical actions rather than grand romantic gestures. They will go out of their way to help you with practical matters, such as offering assistance with tasks, providing advice, or solving problems. They want to show you that they care about your well-being and are willing to support you in practical ways.

4. Increased vulnerability: ISTJs are not naturally inclined to share their emotions openly. However, if they have romantic feelings for you, they may gradually open up and become more vulnerable around you. They might share personal stories, express their thoughts and feelings, or discuss their future aspirations. This increased vulnerability is a sign that they trust you and feel comfortable being themselves around you.

5. Quality time together: ISTJs value quality time spent with their loved ones. If an ISTJ likes you romantically, they will make an effort to spend time with you, even if it means adjusting their schedule or stepping out of their comfort zone. They may suggest activities that align with their interests, such as going for walks, watching movies, or engaging in hobbies together.

6. Respect for boundaries: ISTJs are respectful of personal boundaries and tend to take things slowly in relationships. They will not rush into anything and will give you the space you need. If an ISTJ likes you romantically, they will be patient and understanding, allowing the relationship to develop naturally at a pace that is comfortable for both of you.

7. Thoughtful gestures: ISTJs show their affection through thoughtful gestures rather than extravagant displays. They may surprise you with small gifts, remember your preferences, or do things that make your life easier. These gestures demonstrate that they are thinking about you and want to make you happy.

It's important to note that every individual is unique, and these behaviors may vary depending on the person and their specific circumstances. It's always best to communicate openly and directly with the ISTJ in question to understand their feelings and intentions clearly.