OP, I'll be honest with you. You confessing your love for her will already be affecting her relationship. You're her ex-boyfriend. She clearly still cares for you since you're still friends, but that would have been hard enough for her new partner without now knowing that you're still in love with her. If she still loves you, then she will say that. But you have to be prepared that she may not.

Your confession is likely going to change things and you have to be ready for that being a positive change or a negative one. My advice would be to put a bit of distance between you both while you take some time to heal. Being around her constantly, texting and calling her daily, seeing her with someone else, all while you want to be with her... that's really difficult to move on from. Give yourself some time to recover from the breakup because you clearly haven't. Wishing you all the best, OP.

Yeast infection waiting to happen. Gf needs to change her ways immediately. It's unhealthy and she must reek using the same underwear repeatedly, what does she do when she has a period??

"I am a relatively clean person."

Followed immediately by evidence that he is clearly not a relatively clean person given the fact that he is happy to share underwear and wasn't even able to see that gf had opened the new pack, then put the dirty underwear back in the packet and with freaking discharge on. (Trust me, I'm a girl, that shit smells and is obvious if it had as much as OP says it had.)

Gf is undoubtedly the worst of the two but OP is not as squeaky clean as he likes to think.