help pls

the other day me and my boyfriend had unprotected sex. i initiated it but during I kept on saying i wanted to put a condom on but then he finished. he felt REALLY bad and i took a plan B.
i told him to not think about it anymore because it's useless now and that we should just never do it again 
i think i like him too much and would let him get away with anything.. i really don't want to get hurt what should i do? 
(also im getting hives from the Plan B, have anyone else had this! what do u do?)

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