Hi, I would really appreciate some advice on my situation.

Long-story short: I am a first year undergrad in my first relationship, with a girl that I have genuinely strong feelings for. I only see her every other weekend, but despite that almost everything is great when we are together. She is my first sexual partner ever, while she’s had one before me. Due to my typical young male insecurities this has bothered me, especially knowing that everything we’ve done together she’s done with her ex. The situation is made worse by the fact that she refuses to do something for me that she used to do for him. We did it once, after I nearly broke up with her but she refuses to do it again even though I really liked it and it’s a pretty normal sexual thing though one-sided… I really love her and that’s why I want this to work out, but I know I can never be fully happy knowing that she is not willing to do something for me, who she claims she loves more than anything, that she used to do to please her scumbag ex, who she says she wasn’t in love with. If it wasn’t for that thing I really wouldn’t mind staying in this relationship despite the distance. I have made it clear to her why this is so important to me and intend to give her time without pushing for it and see if she’ll agree at some point, but I have a feeling that this is not going to happen.

Any advice on what to do and if you’ve been in a similar situation would be really appreciated.