Secure in me vs losing interest. Not her priority anymore?

Hi I have been dating a girl for over a year now. we are in our late 30s. it has been a good year but the last couple of months have been strained. we don't live together but i get to see her every weekend. so we have space from each other during the week whether we like it or not!! i know there is always a point where the "honeymoon" phase of a relationship fades to a normal plateau. But she exhibits a manner of being uninterested. she tells me she loves me and looks forward to seeing me. yet when i go for 3 or 4 days she will often choose to spend at least one of those nights together out with friends. these are friends she sees regular during week day evenings. am i being selfish or unreasonable to expect her to make me a priority for that weekend. often i get left on my own at her house in the evening because she has gone out and i wasn't invited. this hurts because i have made sacrifices that to be there (because I want to be with her so i don't count the cost) but she seems to be happy to pass up the limited time that we do have together in order to spend time with her friends who she sees most days of the week plus regularly in the evening. i am glad she has girlfriends and will never dictate who she sees and when. but i feel guilty now that i want to be a priority on those weekends and bad when i complain that she isn't making me that priority in her life anymore. i am not clingy and don't want to push her away. but surely relationships are a two way street. is she just secure in my love and doesn't feel the need to spend time with me now? or is she losing interest? any help gratefully received :) thank you

I'm probably not the best to respond as I have such a dysfunctional relationship myself but froma woman's point of view your girlfriend was given an inch and she took a mile. I think she knows you'll be there like a comfy pair of slippers and gets to do what she wants without considering your feelings, if she says she lives you then I don't think it's intentional. The best way to handle comfy women is to remove the comfort zone. One weekend out of the blue, even if you're dying to see her, don't go, stay at home, don't try to make her jealous or say you're going out, just stay home and don't be tempted to check whether she finds that unusual or text or call, in her own time she will think... Hang on a minute why doesn't he want to be here? I know that beyond 30 mind games should be a thing of the past but sometimes a gentle nudge in reminding someone how much they love you or making them miss you and not being so predictable is the way forward. Plus without causing arguments, after 2 attempts of this and no response from her, unfortunately you will have deciphered that she's not worth your effort and time and it the relationship, dignity intact. I hope I've helped a little :)