Please help is this genital herpes?

it stings when i wee and hurts like 2 days after sex i thought to begin with it was just because of rough sex ive been with my partner 6 years so im confused to why i have caught this whatever it may be:(

does this also mean my partner could have cheated:(

i would go get tested for but it could be herpes. don’t panic though it’s good you’ve caught it and are being responsible about it.