Should I feel bummed out about Valentine’s Day over my short term relationship ending?

I was in a relationship with this guy in November recently of 2022, we were together for 3 weeks but it turns out he was cheating on me talking to other girls while he was overseas and I found out when we were almost together a month! It blew my mind because things seemed to be finally making sense for me and we connected well but I look back on it like he manipulated me and was only telling me what I wanted to hear. I know this relationship wasn’t long enough to be really attached to someone but it still disappoints me a little bit because of how people can be this way but I’m not really triggered or bothered since I wasn’t with this guy long. I’ve decided to treat myself this Valentine’s Day:) Thoughts?

Should I feel bummed out about Valentine’s Day over my short term relationship ending?
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