It's kind of hard to help without knowing more about you.
Are you a winning player? What are your goals in poker? Do you play live or
online poker? How much time daily do you spend on poker? How much time do you spend studying poker? Do you neglect your SO's needs while you play poker? Do you neglect house chores in order to play poker? When asking yourself all these questions, you might even notice that poker isn't really the problem. Maybe your SO doesn't believe that poker is a game of skill and if so, educate him/her.
I find that the key to every relationship is trust and communication. Everything can be sorted out, just talk to your partner. Be honest about yourself, about your goals and dreams when you talk and I'm sure you guys can work it out. After all, you picked your partner for a reason, you've decided on your SO because you want to spend the rest of your life with him/her.
Most importantly, be honest to yourself when you are evaluating your poker skills. Don't think you can be playing poker for a living, when you had 2 great months of running good and suddenly you think you can become a real crusher, so you neglect studying and improving your game.
I've had loads of talks with my girlfriend about poker and she understands now, she even supports it. I've had to explain myself in detail, we've made some compromises regarding chores and how we spend time together and now she's completely fine with it.
Sometimes, she still doesn't give me enough time or space to do poker, no interruptions while playing is the key, but it's a work in progress. It got much better than it was at the start and I'm sure it can get better with you too.