Dating

Should I feel bad I had sex once with an ex boyfriend who cheated on me?

So basically me 24 F I was in this relationship with this guy 20 M for almost a month and things seemed to be going great as we were talking online for a week then we met and went on a few dates till we called it official, he told me he wanted to take things slow but have something serious together so we were in a relationship and he was in the navy and had to leave for his job, I waited for him throughout the whole month to find out when he got back on social media he was cheating, talking to other girls behind my back, he breaks up with me over snap the same day I find out that he was doing that saying “I’m sorry I wanna tell you that I really like you but I’m not ready for anything serious like I thought I was” then I was like asking why what happened before I found out about the cheating then I was like “never mind, I know why” then he blocked me.. it completely blindsided me and made me feel bad I got vulnerable with this guy. I know I didn’t know him long or wasn’t in a relationship with him long but should I feel stupid for having sex with him?

Should I feel bad I had sex once with an ex boyfriend who cheated on me?
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