Future of a marriage with a woman 20 years elder

Hi everyone, I am a 22 years old man/boy and I am really attracted to a lady who is almost 20 years elder than me. I am emotionally immature and kinda frustrated. I have several mental problems that kinda torture me, in addition, I feel very lonely and tired. Whenever I'm with her, I totally forget everything and calm down. I don't love her, but I really like her. Besides, I know that she has had a very hard life. She has been hurt so many times and I just don't want to bring more tears into her eyes. We are somewhat close and we have already slept together like once. I want to start a relationship with her, but I am not sure about it. I don't want us to fall in love, but just in case if it happened by time, considering the fact that I don't want to make her cry, the only option remained would be marriage. How do you see the future of such a marriage? What will be the problems and can they be overcome?

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