Is it normal that i feel the need to love her?

Hi everyone! I've known this girl for almost ten years now and we're great friends, we would like to say best friends and maybe more even if we didn't hang out that much, just catching up for like a month in summer and winter in the mountains. However in the last two years we hung out a lot and we were definitely more than friends, I mean having sex and saying "I love you" more than "how you doing", but she never wanted us to be a couple or to be really "together", because she knew she wanted to find someone different from me and eventually she did. That was totally the best time of my life and anyway, even if things have been over for let's say ten months now, we still keep in touch and things. The thing is that when whe see each other or even just text I really can't hide what I feel and what I feel is still the same love as before the break up, because we did never really break up, and it it something too great for me to keep inside so I end up telling her because it is the best thing that happened to me in my whole life, she is the best thing that happened to me in my whole life, even if I'm afraid she could not be comfortable with it since, you know, she's in a real relationship now. Is it normal to feel this urge? I mean I kind of feel sick if I think she could forget how much I love her, I don't know, like I want to be sure she knows that I'll always be there for her and that I'll always love her even if she doesn't want to trust it but it really is what I felt the first time I told her and it didn't change since then actually... But don't get me wrong I don't want to force her to come back, it's obvious that I'd love it but I'm happy for her being happy even if with another man. Do you think I should better hide it all and pretend to be fine? Thanks.