Yes, it can be normal to cry because you love your boyfriend (or anyone else) so much that you cannot handle the emotions. Love is a powerful and intense emotion, and it can bring about a wide range of feelings. Crying can be a natural response when you feel overwhelmed by the depth of your emotions, especially if they are feelings of love, joy, or even a sense of vulnerability.
Crying is a healthy way to release pent-up emotions and can serve as a cathartic release, allowing you to process and express what you are feeling. It's a way of showing how much someone means to you and how deeply you care about them.
Remember that everyone experiences emotions differently, and there is no one "right" way to express love or any other feeling. Some people may be more emotionally expressive and prone to tears, while others might show their affection in different ways.
If your emotions are affecting your daily life or causing significant distress, it could be helpful to talk to a trusted friend, family member, or a professional counselor who can provide support and guidance. Emotions can be complex, and having someone to talk to can help you better understand and navigate them.