<human>: Me M20, her F20, him M20

I have known her for 4 months and she has been dating her boyfriend for a little less than 1.5 years I think.

I will keep this short but can provide extra details when asked.

I have been pretty much dating her for the last 4 months. I see her at least once a week and up to 5 times a week. Usually she will just cook me dinner and we would watch and movie and cuddle usually until she falls asleep on me. Or if i am tired ill just go to sleep on her lap or chest. Or if we go out, we will go on a walk, go biking, or go get a drink. 

I feel like we are already in a relationship. I am 99% sure she has feelings for me and she gets jealous if I talk about other girls. Many people that we have met, have told us that they assumed that we were in a relationship by the way we acted and some have said it's clear that we both like each other. She just blushes. 

Her boyfriend is not a bad guy, but in all honesty he isn't a good boyfriend, for reasons i wont list. This does not make me feel any worse about what I am doing however and does not justify my actions.

I emotionally cannot do it anymore. I need to say something. I don't want to pressure her. I just want to let her know that I am an option and let her decide.

What is the least awkward way to say this? Can any girl who was in this situation give tell me what you would want/not want to hear?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I can't do it anymore. I need to tell a girl in a relationship how I feel. I am almost sure she has feelings for me. Help?