3. She often talks about missing her ex-boyfriends
When a woman is head over heels in love, her mind will never trace back to her exes, and in comparison to them, you will always be winning. So this is a very alarming sign if she talks about missing her ex-boyfriends with you.
You are supposed to be the man who she loves and respects, and her love for you should be stronger than any kind of love she felt before towards anyone. If she starts missing her ex-boyfriends and implying that they were better than you in so many aspects, this is a sign that her love for you must be fading, or that she never really loved you at all.
4. She does not let you meet her family and friends
The woman who wants to have a serious relationship with you should introduce you to her family and close friends at some point because this means she views you as an important part of her life and wants you to meet other people who play a huge part in it. But if she constantly avoids throwing a family meeting or taking you on a stroll with her best friends, and makes excuses when you bring it up, this might mean that she wants to date you casually without obligations, or that she is not entirely proud of your relationship.