Why is it that us females let us guys make us feel like we're not worth a dime when in a relationship.?

we can think that we have the best relationship until he cheats on us. he say he love you but if he loved you why would he cheat on u or want other females? thn whn we take them bck they continue to do the same thing but u put up with it...&now your stuck feeling like u dont mean shyt nor worth shyt