Am i cursed?

I find myself in a complicated situation, i feel my heart is dead due to years of tumultuous relationship. I find being single more peaceful than relationship. Some will think it's probably from the people I've dated but that's not the case. They are good people and they showed me love in every way i can imagine but I don't feel the same way, i can't bring up my heart to love them as they do with me, i end up hurting them and we go separate ways. Maybe I've not met the right person? But who is the right person? The only person i loved with all my heart betrayed me 10 years ago, since then i haven't met any like her. The one i love, she barely understands me or what i like. The one who understands me and what i like i can't bring myself up to reciprocate the care she has shown for me. I'd like to think this is a phase... But the thoughts I'm having scares me, heck the thought of marriage doesn't excite me anymore . I find it a burden, i feel ill be happier if i rather bury myself with work and take myself out during weekends. No stress, no dramas. I've experienced the worst heartbreaks, I've seen marriages collapse, I've seen what it does to people. Maybe that's what's stopping my heart from opening up again or maybe I'm just cursed.