I could give some advice, but why would you accept advice off of someone who has failed more than once in that department.
The only success I had was over 20 years ago and with my athiest ex wife and someone who had mental health issues and had long term commitment issues. With both women it was similar situation, got to know each other over a short time, then went for a walk along the shore, resulting in holding hands, that is a good indication I think, just slip your hand in her hand as you walk, then we just smiled at each other, stopped looked into each others eyes and kissed, then I told her she was beautiful and I loved her.
After my Divorce and my body has now become hideous and repulsive to women, I ended up in same situation as TinTin, met a fantastic young lady in a Christian chat room, ended up calling each other every night and spent like 6+ hours just talking, we even watched TV together, it was fantastic! After a few months she said she would love to spend some physcial real time with me, so she drove down we did stuff, had lunch.
Came the time where I felt so right with her, it was fantastic, we had that eyes engaged look with a huge tension, as I stared into her eyes I told her how beautiful she was and I loved her, then she broke off and said "I have to go home now" and she departed, I never heard from her for weeks, then I got an Email saying she did not want to see me again and we were finished, no real explination as to why.
I have a number of other similar stories after that, but I do not want to come across as a complete and utter reject failure.