Maybe that cold and dark is something that's coming from within YOU.
I think you have an unconscious belief that, for some reason, it's not going to work out - that it's going to cause pain - that you're going to be hurt, again. Law of attraction is unerring. You broadcast the vibration which matches that belief, which attracts into your reality people who validate what you're afraid is going to happen. Then you get to be right; time after time, they're not good for you. However, there's security in the consistency and familiarity of your finding people who aren't good for you, which satisfies the needs of the agenda your operating, which encourages the cycle's continuation.
Focus on and practice having the relationship with yourself you would like to share with someone else. Find satisfaction within it and focus on those things and good feelings you really enjoy about it. When you carry with you that relationship you've always wanted, not only will it not matter what other people do, since you'll know there's no way you can lose your relationship, but you will then be broadcasting the vibration of that successful relationship which will attract matches to IT.
Be patient. Don't think the relationship isn't happening just because it's not in physical evidence yet. The evidences will become apparent as your happiness expands within the journey, not something to be achieved as the destination. Loving yourself is the most attractive thing you can show other people. And don't worry when, in contrast, the momentum of the old agenda makes itself known. As stubborn as it might be, keep reaching for better feeling thoughts and having fun with it, and the momentum of the new agenda will eventually overtake that of the old.
Good Luck. 🤗