I love my boyfriend so much but I feel guilty when I think of our relationship for no reason

I truly love him. I will be together with him for almost 2 years. I suffer from anxiety and perhaps OCD. I’ve never had a bad experience with my bf. We rarely argue and are happy most of the time. We are long distance (he lives in Germany and I live in the US.) I trust him and don’t think he’s cheating and he does the same. It’s otherwise so perfect. He’s my first real boyfriend and honestly I don’t want anyone else. Ive had a lot of bad experiences with guys in the past. Lately my anxiety has been getting worse. I just visited him and the entire month I was with him I was perfectly content. No anxiety, no worries, no guilt. I would wake him up with kisses and everything was perfect. When I left to come back home I felt very sad and now everything has manifested into me feeling guilty for no reason when I think of our relationship. I don’t know what to do. I do have abandonment issues from when my parents left me at my grandparents and never came back. I also can have low self esteem at times. It makes me sad because I know how good I have it and how well he treats me and I want to appreciate fully without having doubt in my mind.