Why am I so jealous?

I have been jealous since I was about 12 even with my parents if a man would stare at my mom I would get offensive and do ugly faces to the men and also the same with my dad. It escalated real quickly when I found out my mom was cheating on my dad and I kept it a secret to myself for 3 years and told nobody because I didn’t know what to do and I was even more jealous. I started to have relationships with guys and they would cheat on me and I would still trust them and they would hurt me but I didn’t feel jealous at that time I don’t know why. Until i met someone online who is now my husband. My jealousy makes so many things difficult and mostly arguments because I am extremely jealous. I don’t know what to do. Should I seek help? Did this happen because of my mother? Was I born this way? I need to know because I am never at peace because I am always jealous.