Should i just 'get over it'

Lu
I was I was with my partner for 3 1/2 years and we have a son who is one year old. And we broke up about three months ago, and he slept with a girl. He then rang me afterwards bragging about how she let him come on her face. (I never let him do this). He slept with her about five times and then about two minutes ag he slept with her about five times and then about a month ago he started coming over again to see our son. There was still sexual tension beetween us.
Weve slept together several times since then but when we do it i always think about what he did with her. It makes me angry and i feel disgusted with myself then. 
Am i just being silly and should just get over it or should i try and move on? 

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