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See if your girlfriend involves you in major decisions. Pay attention to who she introduces you to. See if your girlfriend treats you with respect. Be cautious if your girlfriend treats you with suspicion.

Article:
When your girlfriend asks you for input on a significant life decision, it shows that she trusts you and values your opinion. On the other hand, if she often makes substantial life decisions without asking your input, this could be a sign that she does not fully trust you or feels that your opinion is not valuable. Major decisions include, for example, a change in job or career path, a change in housing, or planning and executing a long-term vacation. If your girlfriend trusts you and values you as an important part of her life, she’ll likely introduce you to her close friends—both male and female—and to her parents, siblings, and other family members.  On the other hand, if your girlfriend keeps you away from the people in her life who matter most to her, you probably do not have her trust. Introductions to family members and close friends will generally take place within the first 6 months of a relationship. Don’t expect your girlfriend to make these introductions within the first few weeks of being together. In any healthy relationship, respect and trust go hand in hand. It’s nearly impossible to trust someone that you do not respect, and vice versa. If your girlfriend respects you, she’ll treat you kindly and compassionately, ask about your day, and generally show that she enjoys being with you. These behaviors will indicate that she trusts you, as well. Respect, along with many other healthy emotional connections, works both ways. You need to show your girlfriend respect in order for her to develop respect for you also. It’s a clear sign of mistrust if your girlfriend shows constant suspicion of your whereabouts, friendships with other women, or actions when you’re not with her. If you’re concerned by this type of behavior from your girlfriend, ask her about it calmly but directly.  Signs of suspicion or a lack of trust can include: trying to unlock your phone or read your texts, reading your emails, following you when you’re out with friends, or searching through your clothing or possessions. Say something like, “I noticed you reading through some of my texts and emails yesterday. I don’t appreciate you doing that, and I hope I haven’t given you a reason to be suspicious of me. Do you feel that you can’t trust me?”