<human>: I (20M) have been getting the feeling lately that my girlfriend (21F) has been giving our relationship and myself personally a low priority...
We certainly enjoy our time together very much but it seems when I ask something of her there is always an excuse as to why she can't do it. This has been happening for about 3 of our 4 year relationship.
I am really frustrated by this as I do so much for her, I am always the one to go to her house to see her, and I always make plans around what time together we have and she really seems to take it very much for granted.

I have tried talking to her about this but I always end up being the bad guy and her being in tears. It is very frustrating that I am expected to do all these things yet when I occasionally ask something of her (like to come and spend a weekend down at my dad's with me) she really fights me every step of the way.
Sometimes I give up because it's not work making her upset and other times I push it because I really want it (not that this always works).

Sometimes I will convince her to do something with me, but closer to the date she will come up with some excuse as to why she can't do it.

I really love her and I am absolutely positive she loves me, but I just don't feel she puts in the effort that I constantly do.
It often leaves me feeling rather depressed and unimportant.

I work full time and she is currently finishing her uni degree, I am really proud of her as she is doing very well.
She plays for 3 different basketball teams so each weeknight she has basketball (barring Friday). She also plays social on Saturday afternoon, which can give me time to go out and do errands.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Girlfriend often sets me as a low priority and does not put effort into the relationship nearly as much as I do - left feeling depressed and unimportant.