If your boyfriend is engaging in these 10 behaviors, he may not necessarily be on the verge of cheating on you with your friend. However, it's important to recognize that he's crossing a line and needs to set some boundaries. It's crucial to distinguish between being friendly and behaving inappropriately.

1. He looks at her like that

As someone who knows your boyfriend well, you're familiar with the various expressions he wears. You can easily tell when he's bored or genuinely invested in something. When your best friend walked into the room and introduced herself to him, you noticed he gave her the latter look. However, it appears that he's been consistently gazing at her with that same intense look, almost as if he's unable to resist.

2. He's very friendly

If someone is naturally sociable, chatting with friends is nothing to be concerned about. However, if they start to become unusually talkative only when a particular friend is present, it may indicate a problem. This behavior could be a sign that they are trying to impress that friend.

3. He Finds Her Antics Cute

You have certain pet peeves about your friend, such as her tendency to monopolize conversations and be the most vocal person in the group. Strangely, your boyfriend seems to be completely taken with her. He might even comment on how funny she is or how much he enjoys having her company.

4. He Spends A Lot Of Time With Her

While you're all socializing together, you've noticed that your boyfriend often ends up in a corner chatting with your best friend. This becomes particularly concerning if it seems like you're completely ignored whenever they're together. While it's great that your partner gets along with your friends, it's not acceptable if it comes at your cost.

5. Others Have Noticed What's Going On

It can be difficult to discern whether he is displaying friendliness or flirtatious behavior towards her. However, if your other acquaintances have remarked on their intimacy or the amount of time he devotes to her, that could be another indication of a potential issue.

6. He Always Sits Across From Her

Observing someone's body language can reveal a great deal about their thoughts and emotions. For instance, if your partner consistently sits across from your closest friend and seems to gaze at her frequently, this behavior may raise suspicion. Additionally, indications that he is drawn to her could manifest in gestures such as positioning his body towards her or making physical contact with her hand during discussions.

7. He Asks If She's Joining You

You plan an outing with your friends and deliberately omit mentioning your closest companion to your partner. However, he inquires about her and expresses curiosity about whether she will be accompanying you. This behavior may be concerning. Furthermore, when you inform him that she cannot attend, he appears disheartened, exacerbating the situation.

8. He Takes An Interest In Her Life

If your partner is intrigued by your friend, he may attempt to gather more information about her. Even in her absence, he may inquire about various aspects of her life, such as her relationships, other companions, and her personal affairs. In particular, he may exhibit an intense interest in her romantic interests.

9. He Puts You Down In Front Of Her

If your partner is unkind, he may attempt to impress your friend by belittling you. He might do this by teasing you about your lack of culinary skills, for instance, merely to amuse her. This conduct could also be viewed as a way for him to form a bond with her at your expense, almost as though they have a friendship developing without you. Regardless of whether or not he has romantic feelings towards her, this kind of behavior is unscrupulous.

10. He Steps Up For Her

If your friend informs you that she requires assistance in relocating to a new residence and your partner immediately volunteers to aid her, or if she seeks help with a technical issue on her phone and he is the first to offer assistance, it could be concerning. While it is appropriate to be supportive of your friends, it is not appropriate for your partner to go to such lengths to impress them. It is worth noting that he is already in a relationship, which he may have conveniently overlooked. This behavior is insensitive and disrespectful.