Doubting my feelings for boyfriend since becoming anxious and slightly depressed

I have been going out with a guy since November. For the first 2 and a half months everything was perfect and we became serious pretty fast. Then at the end of January everything went crazy. I got hammered at a party and kissed a male friend for about 2 seconds before realising what I was doing then running away. I spent five days literally agonising about whether to tell my bf or not (it was meaningless vs. I don't want to hide things from him) and eventually did. He was alright about it and we agreed to draw a line under it. Around the same time my university and extracurricular commitments went through the roof. I was left with absolutely no time for myself. This led to me developing anxiety and depression, which I have seen a counsellor about and am trying to do some CBT about. I have small panic attacks about various things almost daily. ANYWAY Throughout most of this time I have started to doubt my feelings for my boyfriend. When I am feeling less anxious I am certain that I love him: he makes me laugh, treats me incredibly well, I am very attracted to him, we have great sex, he gets on brilliantly with my friends and family, I can really see a future for us. Then at other times I just start having really negative thought spirals about it: I don't love him, I'm just convincing myself. Thing is, we are still in early days territory really. Although everything took off super quick, we have only been together around four months. I don't see why I can't just chill the hell out. Unfortunately I am prone to overanalysing everything, particularly relationships. My last few relationships ended badly and I was very hurt and upset. I can't really imagine getting past the 4 month stage with anyone, not specifically my current boyfriend. It almost feels like I'm looking for trouble. I think I just need to chill the hell out and enjoy the time we spend together. I have told him the vast majority of this (except the part where I doubt my feelings for him, because that just seems a bit hurtful) and he is being incredibly supportive of my anxiety. However, it is driving me a bit mad. I don't want to break up with him because he's bloomin' awesome and I know that when I'm not stressed I am super happy. My subconscious is definitely in love with him. It's just stopping all these stupid negative thoughts that I would like some help with. I think if we broke up it would make me feel better briefly because it would be one less thing on my very overcrowded plate right now. However, he is definitely the best person I've ever dated and I don't want to throw that away. Help!

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