From my POV...
1. As a single person, decide already to have a happy marriage.
How? By getting to know yourself, through being aware of your values, strengths, weaknesses, personal issues. Become Ms. Right and have a dedication to become a better person, so you will have a high chance of attracting Mr. Right who is also committed to self-improvement. Try to complete yourself without relying on someone to complete you or rescue you. Pwede rin namang single forever, si Mr. Right ay bonus na lang.
When dating, observe what kind of family he has and how he relates with his family members, most probably this is how he will relate with you in your future home (Homing instinct ika nga, unless he has a strong self-awareness and dedication to stop in his own family the dysfunctional dynamics he got from his family of origin). Observe too how he relates with people whom he doesn't need to be nice with (e.g., janitors, waiters), there's a high chance that this is how he will relate with you when he doesn't need to be nice to you. Kung magalang sya kahit sa pulubi, magalang talaga syang tao.
Do not settle for less, wag kumuha ng batong buong buhay mong ipupukpok sa iyong ulo. Maging mapili, gaya ng pagiging pihikan mo sa pagbili ng sapatos, damit, at ibang importanteng bagay para sayo. Dahil itong taong ito ang makakasama mo pang habang buhay, di katulad ng sapatos o gamit na pwedeng itapon pag wala ng saysay. Di mo kailangan ng Mr. Perfect, wala namang ganun, ok na si Mr. Right.
2. Tap into your Higher Power: God, Buddha, Allah, Life, Vishnu, etc.
Ultimately your Higher Power is your source of strength, patience, understanding, forgiveness, wisdom, humility. And these are all important when you're living with someone who is a totally different person from you. Tao ka lang, may mga oras at mga pagsubok wherein manghihina ka, and it's your Higher Power who will be your source and aid. Being a Catholic, si Lord ang takbuhan ko kapag di ko na kaya ihandle ang sarili ko o ang sitwasyon naming mag-asawa. Pag hirap magpatawad, magdasal. Pag hirap magpakumbaba, magdasal. Pag sobrang galit, ibuhos ang galit kay Lord. Para konti na lang ang natitira para kay husband.
3. Continuous Education and Lifetime Learning about marriage and relationship.
Know the effect of gender differences and personality differences in relationships. Gary Chapman's 5 love languages. John Powell's 5 levels of communication. Principles of Fascinating Womanhood for healthy marriages. Your lolo and lola's secrets in reaching their 50th anniversary. Etcetera, etcetera, etcetera... These are all helpful in making your marriage work. Reading this thread and the likes is one way to do it.
4. Become a team.
Of course dalawa kayong kinasal. Hindi lang naman ikaw ang pumunta sa altar. So tulungan, bigayan, unawaan till the end, at walang iwanan.