Am I being jealous about my girlfriend’s ex or sensing a real red flag?

My girlfriend and I just got back together after we broke up in November. We were together two years before that. She had a boyfriend from December to February. They still talk but to be honest I feel like I’m a third option. The guy is very weird and can be kinda aggressive toward people. I just feel like maybe it’s just me overreacting but then again I can’t help to think something going on

Am I being jealous about my girlfriend’s ex or sensing a real red flag?
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