I'm [19F] worried that my boyfriend [29M] of three years doesn't find me attractive anymore and only liked me because of my young age

We've been dating for three years now, since I was 16. At the time he seemed like such a great person, older, handsome, mature and I couldn't believe that he was actually interested in me. It made me feel special compared to my peers who were mostly dating guys our own age. He gave me presents, complimented me, told me how smart and mature I was, and that he loved me. He was my first boyfriend too so he was my first everything and at the time I felt incredibly lucky to have him, imagining that we'd get married one day.

And everything seemed to go great too but in the last months not so much anymore ... he doesn't seem as interested in me anymore. We don't spend as much time anymore together, he often claims to be busy now, and when we do it's not the same, he used to love being with me but now I usually have to initiate if I want anything to happen and even then he often seems unwilling and sometimes says that it's not a good idea right now or similar things.

Then the other week I was out shopping and I accidentally saw him walking around with a younger girl, my guess would be around 15 or 16, and they were physically close, he had his hand placed over her shoulder. It made me feel sick.

I keep thinking that he probably just keeps me around until he sees whether he can get anywhere with this younger girl. It makes me feel gross too, like it's my fault that he seems to be only into younger girls and there's something wrong with me growing up. It really sucks because I genuinely loved him and thought he loved me too, now that I'm pretty sure that he only liked me because I was young I feel shitty and undesirable.

I think I'll probably break up with him myself before he can do so. At least then he doesn't get to dump me for a younger girl. Do you think I'm being reasonable? I mean I am making the right conclusions, right?

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tl;dr: I'm worried that my boyfriend of three years doesn't find me attractive anymore and only liked me because of my young age. He also seems to be testing the waters with at least one younger girl and I think I should probably break up with him.

Submitted November 18, 2018 at 11:21AM by FitRow9 https://ift.tt/2To2Srp