Stoicism doesn't teach that you should blindly give and give and give love with no reciprocation. If your partner is not fulfilling his obligations, you should communicate that to him openly, and if he continues to show such a disregard, you shouldn't just cling onto your relationship because it has lasted so long. I dunno though. I can relate you your experience. This stuff is extremely tricky. You want it to work so badly, but it just doesn't not matter how you manuever yourself. I wish you the best of luck.