What should i do ?

So i wanted to get things on with my girlfriend who I missed, you know tease her a little let her know what i wanted in a way. she then said she couldn't be with me which my broke my heart considering I had seen her the day before. but truth is, she really hasn't been wanting to do it lately. I have noticed she's been hanging around with a "friend" lately. she's really pretty and the only thing I can assume is that she's more attracted to her cause she's way hotter. Maybe i'm not as beautiful as I once was.

Maybe if I were to lose a little more weight, get a darker color she'll love me once again. maybe if I put more makeup on i'll be more attractive. but i've never been one to care what other think , but this really broke my heart.

Should I talk to her tell her she broke my heart, or maybe change myself a bit so she can love me and she me love how she once did ??