Past wounds can get stuck in your energy field and chakra body creating feelings of lack and fear as well as many other issues. Becoming conscious of how you feel is key. Throughout the day check in with yourself and see how you are feeling. Notice how you feel around certain people. Do this exercise with no judgment; just observe.
When you feel as if you are getting triggered breathe and ground yourself. You can do this by simply imagining your feet are like the roots of a tree. Anchor into your divine line and attach it to the front of your spine. Breathe again and notice if this person is still able to trigger you or if you can fill yourself up with yourself and let it go. Connecting with our inner children can help with this.