Question

How do I tell my boyfriend that I like his sister?

Answer 1

This is a hard situation — you’re between honesty and protecting someone you care about. I’ll give practical steps, what to say, and what to consider so you can choose the path that fits your values and safety.

First, think before you speak
- Clarify your own feelings. Is this a fleeting crush or something you want to act on? If it’s temporary, you might not need to tell him.
- Decide what you want to happen. Do you want to stay with him and work on the crush, break up and pursue his sister, or something else?
- Consider safety and power dynamics. Is the sister a minor or otherwise vulnerable? Is there any risk of a violent or dangerous reaction from your boyfriend or family? If yes, prioritize safety and get support before telling anyone.

When and how to tell him (if you decide to)
- Choose a private, calm time in person. Don’t tell him in a text, in front of family, or when either of you is drunk/angry.
- Be clear, brief, and take responsibility for your feelings. Don’t give lurid details about fantasies or comparisons.
- Emphasize that you’re telling him because you respect him and don’t want to hide something important.

Suggested wording (pick the version that matches what you want)
- If you want to stay together and be honest: “I need to tell you something hard because I respect you. Lately I’ve noticed I’m attracted to your sister. It’s confusing for me. I care about you and I don’t want to act on it. I’m telling you because I don’t want secrets between us and I want your trust while I sort this out.”
- If you think this may mean you need to break up: “I have to be honest because it’s not fair to either of us. I’ve developed feelings for your sister. I don’t want to hurt you; I’m sorry. I think I should step back from our relationship so I can figure this out without hurting you more.”
- If you already acted on it (and you feel you must tell him): “I need to tell you something I regret. I was involved with your sister. I’m truly sorry. I know this is hurtful. I wanted to be honest right away rather than keep hiding it.”

How to handle his reaction
- Expect strong emotions: anger, hurt, denial. Don’t try to defend your feelings right away — give him space to react.
- Avoid arguing about who is “at fault.” Keep the conversation about your honesty and how you intend to move forward.
- Be prepared for serious consequences (breakup, family rifts, him wanting to avoid the sister). Respect his boundaries if he needs space or ends the relationship.
- Offer practical next steps: time apart, couples counseling, or full honesty about what happened — depending on the situation.

Other practical tips
- Don’t tell the sister before telling him (unless safety concerns change that). Telling the sibling first can feel like a betrayal.
- If you plan to pursue the sister, end the current relationship first — pursuing her while with him is likely to cause greater harm.
- Consider talking to a neutral friend or therapist first to sort your feelings and rehearse the conversation.

If you want, tell me:
- Do you want to stay with your boyfriend? Did anything already happen with his sister? I can help write a short script tailored to exactly what you want to say.