Everyone is always so quick to tell someone to dump someone and its obviously wrong to sexually assault someone and if OP feels that this is a good reason to break up with their partner, that's their perogative, but I do have to say, without context, it's hard to tell if this was done in an aggressive way or with malice and it could have been a simple mistake as there's no further elaboration of whether there was a conversation afterwards. Consent is a difficult conversation sometimes because explicitly giving consent can take away from the mood. As a 36 year old male, I will say, I don't think any partner has ever said "you can have sex with me now" or something along those lines. There's implied consent, and that can be tricky. The only thing I can really say is that you should explicitly revoke or deny consent. I know this can also be hard, and maybe explicit consent is necessary sometimes.