Played a 1v1 with some random Yasuo

Was going slowly and carefully with me just outrading then disengaging every time he'd go in on me while letting him push in so I could use my health pad thing. He then asked if I would ever fight him then going in with a flash and trying to winwall my abilities proactively which just let me kill him while he only does damage with one q and an ignite.

Why'd he get so tilted from me not killing myself into him that he'd just tilt all in me?