Why am I turn off about going in committed relationships?

My last relationship ended because my ex cheated on me and got pregnant by my coworker then hid her pregnancy from me and later had his baby. We broke up in March of this year. I met girls who I talk and date but the idea of being in a relationship is a turn off for me. I just want to meet girls for hanging out and for sex basically. The idea of romance, kissing doesn't excite me anymore. Have I develop some type mental disorder?? Please help