How to love

I feel like every relationship I have ever been in, is the guy doesn’t know how to love. I teach him how to love, then the relationship isn’t any good after that. Like the guy I’m with now, we share a baby. Just because we share a baby doesn’t mean it’s love. I mean there’s been many times he has done shit behind my back. For example, going on dating apps, texting girls more then friends, buying me an engagement ring just to have it taken from me when I’m “bad”. My ex husband as well. He did many things to me that I had to teach him not to do with other women. Like he married me and never told me about his genital warts. Of course I asked him but he told me he had no idea what it was, but he knew for years. Still decided to marry me. I don’t understand why I have to teach these dudes how to love. Just for them to go onto love with their full hearts after I end things with them. When is it my turn? When do I get my happily ever after?