Relationship jitters

Anyone else get nervous about being in a long term relationship. Im not someone who’s used to good things happening in my life. Most of my life has been a series of abuse from loved ones and awful short term relationships. For the first time I have a man who loves me, a man who opens doors for me and writes me poetry. We’ve been together 4 months now and I’m terrified. The deeper I get into the relationship and the more I fall in love with him the more scared I get it’s all gonna come to a crashing end one day. I’m so used to getting things, good things taken away from me and I can’t seem to get past this feeling. I’ve had 2 panic attacks this week alone because of this problem.