If you keep getting cheated on over and over, then the problem is you.
Consistent patterns of having cheating partners is indicative of something beyond coincidence. Take some time and learn who the person is before getting too involved.
No person deserves to be lied to and cheated on, and it can happen to anyone.
Simply try changing what you look for in a partner. Instead of going for the player or hot girl, try the guy/girl who is more sincere and genuinely cares about you and supports your dreams.